Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

Area code 410 prefixes

783 of the 786 possible NXX blocks are assigned in area code 410 (99.6% of capacity), spread across 102 rate centers and 27 holders. The largest holders are VERIZON MARYLAND, INC. (507 blocks, 64.8%), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (53 blocks, 6.8%), NEW CINGULAR WIRELESS PCS, LLC - DC (51 blocks, 6.5%). Grouped by brand, Verizon accounts for 607 blocks; brand-attributable holders cover 98% of the code, and the rest are CLECs, VoIP wholesalers and regional carriers that trade under their own names. The assignment records here run from 2001-04-18 to 2023-07-19, with 8 blocks handed out in 2011 alone. 377 blocks (48%) are in thousands-block pooling, meaning the block is shared between carriers in 1,000-number lots rather than held whole – which is why a single NXX can serve several carriers at once. 6 were growth assignments – additional blocks to a carrier that had already filled its earlier ones.

783 assigned blocks of 786

102 rate centers

27 holders of record

48% in thousands-block pooling

Largest holders in 410

Holder of record, as NANPA names it	Brand	Blocks	Share
VERIZON MARYLAND, INC.	Verizon	507	64.8%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD	Verizon	53	6.8%
NEW CINGULAR WIRELESS PCS, LLC - DC	AT&T	51	6.5%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD	Verizon	45	5.7%
SPOK, INC.	Spok	28	3.6%
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC	T-Mobile	22	2.8%
TELEPORT COMMUNICATIONS AMERICA, LLC - MD	AT&T	15	1.9%
PAETEC ITEL, LLC	Windstream	12	1.5%
LEVEL 3 TELECOM OF MARYLAND, LLC - MD	Lumen	11	1.4%
METROPCS, INC.	T-Mobile	6	0.8%
LEVEL 3 COMMUNICATIONS, LLC - MD	Lumen	4	0.5%
BALTIMORE-WASHINGTON TELEPHONE (BWT)	–	4	0.5%

Names are printed as they appear in the assignment records, which is the legal entity rather than the brand. Holding a block is not the same as serving the numbers in it: portability moves numbers between carriers and pooling splits a block between several.

Rate centers with their own page

Rate centers where at least three blocks are assigned, excluding the numbered metro zone codes. The remainder are in the full table below.

All 783 assigned blocks

One row per NXX. “Pooled” means carriers draw 1,000-number lots from the block rather than holding all 10,000, so a pooled prefix can belong to several carriers at once. “Not in service” means assigned but not yet open for calls – a caller ID from one of those is necessarily spoofed. The holder column gives the brand where the legal entity maps to one; the full legal names are in the holders table above, exactly as NANPA records them.

Prefix	Holder of record	Rate center	Assigned	Pooled	In service
410-200	Verizon	EASTON	2004-05-27	yes	yes
410-202	Verizon	SALISBURY	2004-10-14	yes	yes
410-203	Verizon	ELLICOTTCY	–	–	yes
410-204	Verizon	ARBUTUS	–	yes	yes
410-205	AT&T	PIKESVILLE	–	yes	yes
410-206	AT&T	CATONSVL	–	–	yes
410-207	Verizon	BALTIMORE	–	–	yes
410-208	Verizon	BERLIN	–	yes	yes
410-209	Verizon	BALTIMORE	–	yes	yes
410-210	Verizon	GLENBURNIE	2020-01-08	yes	yes
410-212	T-Mobile	ANNAPOLIS	–	yes	yes
410-213	Verizon	OCEAN CITY	–	yes	yes
410-214	CORE COMMUNICATIONS, INC.- MD	RISING SUN	2009-03-11	yes	yes
410-215	Verizon	BALTIMORE	–	–	yes
410-216	Verizon	ANNAPOLIS	–	yes	yes
410-217	Verizon	BALTIMORE	–	–	yes
410-218	Verizon	BALTIMORE	–	–	yes
410-219	Verizon	SALISBURY	–	–	yes
410-220	T-Mobile	ELKRIDGE	2011-09-30	yes	yes
410-221	Verizon	CAMBRIDGE	–	–	yes
410-222	Verizon	SEVERN	–	–	yes
410-223	Verizon	BALTIMORE	–	–	yes
410-224	Verizon	ANNAPOLIS	–	–	yes
410-225	Verizon	BALTIMORE	–	–	yes
410-226	Verizon	OXFORD	–	yes	yes
410-227	AT&T	CATONSVL	–	–	yes
410-228	Verizon	CAMBRIDGE	–	–	yes
410-229	Verizon	COCKEYSVL	–	–	yes
410-230	Verizon	BALTIMORE	–	–	yes
410-231	AT&T	SOLOMONS	–	yes	yes
410-232	Spok	BALTIMORE	–	–	yes
410-233	Verizon	BALTIMORE	–	–	yes
410-234	Verizon	BALTIMORE	–	–	yes
410-235	Verizon	BALTIMORE	–	–	yes
410-236	AT&T	TOWSON	–	–	yes
410-237	Verizon	BALTIMORE	–	yes	yes
410-238	Verizon	ESSEX	–	yes	yes
410-239	Verizon	REISTERSTN	–	–	yes
410-240	T-Mobile	BALTIMORE	2011-10-06	yes	yes
410-241	Verizon	BALTIMORE	–	–	yes
410-242	Verizon	ARBUTUS	–	–	yes
410-243	Verizon	BALTIMORE	–	–	yes
410-244	Verizon	BALTIMORE	–	–	yes
410-245	AT&T	CATONSVL	–	–	yes
410-246	Verizon	BALTIMORE	–	yes	yes
410-247	Verizon	ARBUTUS	–	–	yes
410-248	Verizon	PARKVILLE	–	yes	yes
410-249	Verizon	TOWSON	–	yes	yes
410-250	Verizon	OCEAN CITY	–	–	yes
410-251	Verizon	SALISBURY	–	–	yes
410-252	Verizon	TOWSON	–	–	yes
410-253	AT&T	EASTON	–	–	yes
410-254	Verizon	BALTIMORE	–	–	yes
410-255	Verizon	ARGRGBSNIS	–	–	yes
410-256	Verizon	PARKVILLE	–	–	yes
410-257	Verizon	NORTHBEACH	–	–	yes
410-258	T-Mobile	BALTIMORE	–	yes	yes
410-259	Verizon	WESTMINSTR	–	–	yes
410-260	Verizon	SEVERNA PK	–	yes	yes
410-261	Verizon	BALTIMORE	–	yes	yes
410-262	T-Mobile	BALTIMORE	–	yes	yes
410-263	Verizon	ANNAPOLIS	–	–	yes
410-264	Verizon	WATERLO236	–	yes	yes
410-265	Verizon	WOODLAWN	–	–	yes
410-266	Verizon	ANNAPOLIS	–	–	yes
410-267	Verizon	ANNAPOLIS	–	yes	yes
410-268	Verizon	ANNAPOLIS	–	–	yes
410-269	Verizon	SEVERNA PK	–	yes	yes
410-270	REDI-CALL COMMUNICATIONS CO.	SALISBURY	–	–	yes
410-271	Verizon	ANNAPOLIS	–	–	yes
410-272	Verizon	ABERDEEN	–	–	yes
410-273	Verizon	ABERDEEN	–	yes	yes
410-274	Verizon	BALTIMORE	–	–	yes
410-275	Verizon	CECILTON	–	yes	yes
410-276	Verizon	BALTIMORE	–	–	yes
410-277	Verizon	WOODLAWN	–	yes	yes
410-278	Verizon	ABERDEEN	–	–	yes
410-279	Verizon	ANNAPOLIS	–	–	yes
410-280	Verizon	ANNAPOLIS	–	yes	yes
410-281	Verizon	WOODLAWN	–	–	yes
410-282	Verizon	DUNDALK	–	–	yes
410-283	Spok	TOWSON	–	–	yes
410-284	Verizon	DUNDALK	–	–	yes
410-285	Verizon	DUNDALK	–	–	yes
410-286	Verizon	NORTHBEACH	–	yes	yes
410-287	Verizon	NORTH EAST	–	–	yes
410-288	Verizon	DUNDALK	–	–	yes
410-289	Verizon	OCEAN CITY	–	–	yes
410-290	Verizon	COLUMBIA	–	–	yes
410-291	Verizon	BALTIMORE	–	yes	yes
410-292	AT&T	CATONSVL	–	–	yes
410-293	Windstream	ANNAPOLIS	–	–	yes
410-294	AT&T	CATONSVL	–	–	yes
410-295	Verizon	ANNAPOLIS	–	–	yes
410-296	Verizon	TOWSON	–	–	yes
410-297	Verizon	ABERDEEN	–	yes	yes
410-298	Verizon	WOODLAWN	–	–	yes
410-299	Verizon	BALTIMORE	–	–	yes
410-300	T-Mobile	ELKRIDGE	2004-07-15	yes	yes
410-301	T-Mobile	BALTIMORE	2011-10-06	yes	yes
410-302	AT&T	CATONSVL	–	–	yes
410-303	Verizon	BALTIMORE	–	–	yes
410-304	IDT AMERICA, CORP. - MD	QUEENSTOWN	2006-03-29	yes	yes
410-305	Verizon	ODENTON	–	yes	yes
410-306	Verizon	ABERDEEN	–	yes	yes
410-307	Verizon	TOWSON	–	yes	yes
410-308	Verizon	TOWSON	–	–	yes
410-309	Verizon	COLUMBIA	–	–	yes
410-310	Verizon	EASTON	–	–	yes
410-312	Verizon	COLUMBIA	–	–	yes
410-313	Verizon	ELLICOTTCY	–	–	yes
410-314	Verizon	ARBUTUS	–	yes	yes
410-315	Verizon	SEVERNA PK	–	yes	yes
410-316	Verizon	COCKEYSVL	–	yes	yes
410-317	Verizon	ARGRGBSNIS	–	yes	yes
410-318	Verizon	BALTIMORE	–	yes	yes
410-319	Verizon	BALTIMORE	–	yes	yes
410-320	T-Mobile	ANNAPOLIS	–	yes	yes
410-321	Verizon	TOWSON	–	–	yes
410-322	AT&T	BEL AIR	–	–	yes
410-323	Verizon	BALTIMORE	–	–	yes
410-324	Verizon	TOWSON	–	yes	yes
410-325	Verizon	BALTIMORE	–	yes	yes
410-326	Verizon	SOLOMONS	–	–	yes
410-327	Verizon	BALTIMORE	–	–	yes
410-328	Verizon	BALTIMORE	–	–	yes
410-329	Verizon	COCKEYSVL	–	yes	yes
410-330	AT&T	CAMBRIDGE	–	yes	yes
410-331	Spok	ELKRIDGE	–	–	yes
410-332	Verizon	BALTIMORE	–	–	yes
410-333	Verizon	BALTIMORE	–	–	yes
410-334	Verizon	SALISBURY	–	yes	yes
410-335	Verizon	CHASE	–	–	yes
410-336	AT&T	BALTIMORE	–	–	yes
410-337	Verizon	TOWSON	–	–	yes
410-338	Verizon	BALTIMORE	–	yes	yes
410-339	Verizon	TOWSON	–	yes	yes
410-340	AT&T	BALTIMORE	–	–	yes
410-341	Verizon	SALISBURY	–	–	yes
410-342	Verizon	BALTIMORE	–	–	yes
410-343	Verizon	SPARKSGLNC	–	yes	yes
410-344	Verizon	CHASE	–	yes	yes
410-345	Verizon	PIKESVILLE	–	yes	yes
410-346	Verizon	SILVER RUN	–	yes	yes
410-347	Verizon	BALTIMORE	–	–	yes
410-348	Verizon	STILL POND	–	yes	yes
410-349	Verizon	ANNAPOLIS	–	yes	yes
410-350	Verizon	BALTIMORE	–	yes	yes
410-351	Spok	BALTIMORE	–	–	yes
410-352	Verizon	BISHOPVL	–	yes	yes
410-353	Verizon	ANNAPOLIS	–	–	yes
410-354	Verizon	BALTIMORE	–	–	yes
410-355	Verizon	BALTIMORE	–	–	yes
410-356	Verizon	PIKESVILLE	–	–	yes
410-357	Verizon	PARKTON	–	yes	yes
410-358	Verizon	BALTIMORE	–	–	yes
410-359	Verizon	BALTIMORE	–	–	yes
410-360	Verizon	ARGRGBSNIS	–	–	yes
410-361	Verizon	BALTIMORE	–	yes	yes
410-362	Verizon	BALTIMORE	–	–	yes
410-363	Verizon	PIKESVILLE	–	–	yes
410-364	Verizon	HILLSBORO	–	yes	yes
410-365	T-Mobile	BALTIMORE	–	yes	yes
410-366	Verizon	BALTIMORE	–	–	yes
410-367	Verizon	BALTIMORE	–	–	yes
410-368	Verizon	BALTIMORE	–	yes	yes
410-369	Lumen	BALTIMORE	–	yes	yes
410-370	AT&T	CATONSVL	–	–	yes
410-371	Verizon	BALTIMORE	–	–	yes
410-372	Verizon	TOWSON	–	yes	yes
410-373	Spok	TOWSON	–	–	yes
410-374	Verizon	HAMPSTEAD	–	yes	yes
410-375	Verizon	BALTIMORE	–	–	yes
410-376	Verizon	VIENNA	–	yes	yes
410-377	Verizon	TOWSON	–	–	yes
410-378	Verizon	PT DEPOSIT	–	yes	yes
410-379	Verizon	ELKRIDGE	–	–	yes
410-380	REDI-CALL COMMUNICATIONS CO.	SALISBURY	–	–	yes
410-381	Verizon	COLUMBIA	–	–	yes
410-382	Verizon	BALTIMORE	–	–	yes
410-383	Verizon	BALTIMORE	–	–	yes
410-384	Verizon	SEVERNA PK	–	yes	yes
410-385	Verizon	BALTIMORE	–	–	yes
410-386	Verizon	WESTMINSTR	–	–	yes
410-387	Windstream	BALTIMORE	2011-08-12	yes	yes
410-388	Verizon	SPARROWSPT	–	–	yes
410-389	Spok	BALTIMORE	–	–	yes
410-390	AT&T	OCEAN CITY	2009-06-10	yes	yes
410-391	Verizon	ESSEX	–	–	yes
410-392	Verizon	ELKTON	–	–	yes
410-393	Verizon	BALTIMORE	–	–	yes
410-394	Verizon	SOLOMONS	–	yes	yes
410-395	Verizon	ARBUTUS	–	yes	yes
410-396	Verizon	BALTIMORE	–	–	yes
410-397	Verizon	WINGATE	–	yes	yes
410-398	Verizon	ELKTON	–	–	yes
410-399	Verizon	BEL AIR	–	yes	yes
410-400	Windstream	BALTIMORE	2006-06-15	yes	yes
410-401	Verizon	BRYNPKLNCM	–	yes	yes
410-402	Verizon	CATONSVL	–	yes	yes
410-403	Verizon	COCKEYSVL	–	yes	yes
410-404	Verizon	BALTIMORE	–	–	yes
410-405	Verizon	FORK	–	yes	yes
410-406	Verizon	ESSEX	–	yes	yes
410-407	Verizon	ELKRIDGE	–	–	yes
410-408	Spok	TOWSON	–	–	yes
410-409	Verizon	BALTIMORE	–	–	yes
410-410	Charter	BALTIMORE	2023-05-17	yes	yes
410-412	Verizon	GLENBURNIE	–	yes	yes
410-413	Verizon	PIKESVILLE	–	yes	yes
410-414	Verizon	PRINCEFRCK	–	yes	yes
410-415	Verizon	PIKESVILLE	–	yes	yes
410-416	American Messaging	WATERLO236	–	–	yes
410-417	Verizon	EDGEWOOD	2007-08-16	yes	yes
410-418	Verizon	ELLICOTTCY	–	–	yes
410-419	T-Mobile	BALTIMORE	–	yes	yes
410-420	Verizon	BEL AIR	–	yes	yes
410-421	Verizon	SEVERNA PK	–	yes	yes
410-422	AT&T	SALISBURY	–	–	yes
410-423	AT&T	COLUMBIA	–	–	yes
410-424	Verizon	GLENBURNIE	–	yes	yes
410-425	Verizon	SMITH IS	–	yes	yes
410-426	Verizon	BALTIMORE	–	–	yes
410-427	AT&T	TOWSON	–	–	yes
410-428	AT&T	CATONSVL	–	–	yes
410-429	Verizon	WORTHINGTN	–	yes	yes
410-430	Verizon	SALISBURY	–	–	yes
410-431	Verizon	SEVERNA PK	–	yes	yes
410-432	Verizon	SEVERNA PK	–	yes	yes
410-433	Verizon	BALTIMORE	–	–	yes
410-434	Spok	TOWSON	–	–	yes
410-435	Verizon	BALTIMORE	–	–	yes
410-436	Verizon	EDGEWOOD	–	yes	yes
410-437	Verizon	ARGRGBSNIS	–	–	yes
410-438	Verizon	SUDLERSVL	–	yes	yes
410-439	Verizon	ARGRGBSNIS	–	–	yes
410-440	AT&T	CATONSVL	–	–	yes
410-441	AT&T	ELKTON	–	yes	yes
410-442	Verizon	ELLICOTTCY	–	yes	yes
410-443	Lumen	EASTON	2002-07-23	yes	yes
410-444	Verizon	BALTIMORE	–	–	yes
410-445	Spok	BALTIMORE	–	–	yes
410-446	AT&T	CATONSVL	–	–	yes
410-447	Spok	COLUMBIA	–	–	yes
410-448	Verizon	BALTIMORE	–	yes	yes
410-449	Bandwidth	SOLOMONS	2010-02-12	yes	yes
410-450	Verizon	BALTIMORE	–	yes	yes
410-451	Verizon	CROFTON	–	–	yes
410-452	Verizon	CARDIFF	–	yes	yes
410-453	Verizon	TOWSON	–	yes	yes
410-454	Verizon	BALTIMORE	–	–	yes
410-455	Verizon	CATONSVL	–	–	yes
410-456	Verizon	BALTIMORE	–	–	yes
410-457	Verizon	DARLINGTON	–	yes	yes
410-458	Verizon	BALTIMORE	–	–	yes
410-459	Verizon	FALLSTON	–	–	yes
410-460	Spok	ELKRIDGE	–	–	yes
410-461	Verizon	ELLICOTTCY	–	–	yes
410-462	Verizon	BALTIMORE	–	–	yes
410-463	Verizon	TRAPPE	–	yes	yes
410-464	Verizon	BALTIMORE	–	yes	yes
410-465	Verizon	ELLICOTTCY	–	–	yes
410-466	Verizon	BALTIMORE	–	–	yes
410-467	Verizon	BALTIMORE	–	–	yes
410-468	Verizon	BALTIMORE	–	–	yes
410-469	Verizon	BALTIMORE	–	yes	yes
410-470	Verizon	BALTIMORE	2005-06-28	yes	yes
410-471	Verizon	ELKRIDGE	–	–	yes
410-472	Verizon	SPARKSGLNC	–	yes	yes
410-473	Spok	TOWSON	–	–	yes
410-474	Verizon	PRINCEFRCK	–	–	yes
410-475	Spok	TOWSON	–	–	yes
410-476	Verizon	TRAPPE	–	yes	yes
410-477	Verizon	SPARROWSPT	–	–	yes
410-478	AT&T	BALTIMORE	2023-07-19	yes	yes
410-479	Verizon	DENTON	–	yes	yes
410-480	Verizon	ELLICOTTCY	–	–	yes
410-482	Verizon	GREENSBORO	–	yes	yes
410-483	Verizon	BALTIMORE	–	yes	yes
410-484	Verizon	PIKESVILLE	–	–	yes
410-485	Verizon	BALTIMORE	–	–	yes
410-486	Verizon	PIKESVILLE	–	–	yes
410-487	Verizon	GLENBURNIE	–	yes	yes
410-488	Verizon	BALTIMORE	–	–	yes
410-489	Verizon	GLENWOOD	–	yes	yes
410-490	Verizon	CENTREVL	–	–	yes
410-491	AT&T	CATONSVL	–	yes	yes
410-492	Spok	TOWSON	–	–	yes
410-493	T-Mobile	BALTIMORE	–	yes	yes
410-494	Verizon	TOWSON	–	–	yes
410-495	Verizon	PRINCEFRCK	–	–	yes
410-496	Verizon	RANDALLSTN	–	–	yes
410-497	Comcast	PARKVILLE	–	yes	yes
410-498	Windstream	COCKEYSVL	–	yes	yes
410-499	T-Mobile	BALTIMORE	–	yes	yes
410-500	T-Mobile	BALTIMORE	–	yes	yes
410-501	Windstream	ARBUTUS	2005-06-28	yes	yes
410-502	Verizon	BALTIMORE	–	–	yes
410-503	Verizon	ELKRIDGE	–	–	yes
410-504	Verizon	PIKESVILLE	–	yes	yes
410-505	Verizon	ELLICOTTCY	–	yes	yes
410-506	Verizon	ELKTON	–	yes	yes
410-507	Verizon	ANNAPOLIS	–	–	yes
410-508	Verizon	GLENBURNIE	–	yes	yes
410-509	BALTIMORE-WASHINGTON TELEPHONE (BWT)	WATERLO236	–	–	yes
410-510	AT&T	FORK	–	yes	yes
410-512	Verizon	TOWSON	–	yes	yes
410-513	AT&T	PARKVILLE	–	yes	yes
410-514	Verizon	SEVERN	–	yes	yes
410-515	Verizon	FORK	–	–	yes
410-516	Verizon	BALTIMORE	–	yes	yes
410-517	Verizon	REISTERSTN	–	yes	yes
410-518	Verizon	SEVERNA PK	–	yes	yes
410-519	Verizon	SEVERN	–	–	yes
410-520	Verizon	OCEAN CITY	–	yes	yes
410-521	Verizon	RANDALLSTN	–	–	yes
410-522	Verizon	BALTIMORE	–	yes	yes
410-523	Verizon	BALTIMORE	–	–	yes
410-524	Verizon	OCEAN CITY	–	–	yes
410-525	Verizon	BALTIMORE	–	yes	yes
410-526	Verizon	REISTERSTN	–	–	yes
410-527	Verizon	COCKEYSVL	–	–	yes
410-528	Verizon	BALTIMORE	–	yes	yes
410-529	Verizon	PARKVILLE	–	–	yes
410-530	AT&T	CATONSVL	–	yes	yes
410-531	Verizon	COLUMBIA	–	–	yes
410-532	Verizon	BALTIMORE	–	–	yes
410-533	AT&T	ANNAPOLIS	–	–	yes
410-534	Verizon	BALTIMORE	–	yes	yes
410-535	Verizon	PRINCEFRCK	–	–	yes
410-536	Verizon	ARBUTUS	–	yes	yes
410-537	Verizon	BALTIMORE	–	yes	yes
410-538	Verizon	FORK	–	yes	yes
410-539	Verizon	BALTIMORE	–	–	yes
410-540	Verizon	ELKRIDGE	–	–	yes
410-541	Verizon	SEVERNA PK	–	yes	yes
410-542	Verizon	BALTIMORE	–	–	yes
410-543	Verizon	SALISBURY	–	–	yes
410-544	Verizon	SEVERNA PK	–	–	yes
410-545	Verizon	BALTIMORE	–	–	yes
410-546	Verizon	SALISBURY	–	–	yes
410-547	Verizon	BALTIMORE	–	–	yes
410-548	Verizon	SALISBURY	–	–	yes
410-549	Verizon	SYKESVILLE	–	–	yes
410-550	Verizon	BALTIMORE	–	–	yes
410-551	Verizon	SEVERN	–	–	yes
410-552	Verizon	SYKESVILLE	–	yes	yes
410-553	Verizon	GLENBURNIE	–	yes	yes
410-554	Verizon	BALTIMORE	–	–	yes
410-556	Verizon	CHURCHHILL	–	yes	yes
410-557	Verizon	FORK	–	yes	yes
410-558	Verizon	BALTIMORE	–	yes	yes
410-559	AT&T	PIKESVILLE	–	yes	yes
410-560	Verizon	TOWSON	–	yes	yes
410-561	Verizon	TOWSON	–	yes	yes
410-562	AT&T	ANNAPOLIS	–	yes	yes
410-563	Verizon	BALTIMORE	–	–	yes
410-564	AT&T	ELKRIDGE	–	yes	yes
410-565	Lumen	ARBUTUS	–	yes	yes
410-566	Verizon	BALTIMORE	–	–	yes
410-567	Verizon	ELKRIDGE	–	yes	yes
410-568	AT&T	COCKEYSVL	–	yes	yes
410-569	Verizon	EDGEWOOD	–	–	yes
410-570	AT&T	ANNAPOLIS	–	–	yes
410-571	Verizon	ANNAPOLIS	–	yes	yes
410-572	Verizon	SALISBURY	–	yes	yes
410-573	Verizon	ANNAPOLIS	–	–	yes
410-574	Verizon	ESSEX	–	–	yes
410-575	Verizon	FORK	–	yes	yes
410-576	Verizon	BALTIMORE	–	–	yes
410-577	Verizon	PIKESVILLE	2005-05-10	yes	yes
410-578	Verizon	BALTIMORE	–	–	yes
410-579	Verizon	ELKRIDGE	–	–	yes
410-580	Verizon	PIKESVILLE	–	–	yes
410-581	Verizon	PIKESVILLE	–	–	yes
410-582	Verizon	GLENBURNIE	–	yes	yes
410-583	Verizon	TOWSON	–	yes	yes
410-584	Verizon	COCKEYSVL	–	yes	yes
410-585	Verizon	BALTIMORE	–	yes	yes
410-586	Verizon	PRINCEFRCK	–	–	yes
410-587	Verizon	ARBUTUS	–	yes	yes
410-588	Verizon	BEL AIR	–	yes	yes
410-589	Lumen	BRYNPKLNCM	–	yes	yes
410-590	Verizon	GLENBURNIE	–	–	yes
410-591	Verizon	BALTIMORE	–	–	yes
410-592	Verizon	FORK	–	yes	yes
410-593	Verizon	FORK	–	yes	yes
410-594	Verizon	WOODLAWN	–	–	yes
410-595	Lumen	GLENBURNIE	–	yes	yes
410-596	Verizon	WESTMINSTR	–	–	yes
410-597	Verizon	WOODLAWN	–	–	yes
410-598	Verizon	BALTIMORE	–	–	yes
410-599	AT&T	CATONSVL	–	–	yes
410-600	Verizon	BERLIN	2006-04-25	yes	yes
410-601	Verizon	BALTIMORE	–	yes	yes
410-602	Verizon	PIKESVILLE	–	–	yes
410-603	AT&T	SALISBURY	–	–	yes
410-604	Verizon	STEVENSVL	–	yes	yes
410-605	Verizon	BALTIMORE	–	–	yes
410-606	Verizon	WATERLO236	–	–	yes
410-607	Spok	TOWSON	–	–	yes
410-608	AT&T	CATONSVL	–	yes	yes
410-609	Verizon	BRYNPKLNCM	–	yes	yes
410-610	Verizon	PRINCEFRCK	–	–	yes
410-612	Verizon	EDGEWOOD	–	yes	yes
410-613	Verizon	BALTIMORE	–	–	yes
410-614	Verizon	BALTIMORE	–	–	yes
410-615	AT&T	CATONSVL	–	–	yes
410-616	Verizon	TOWSON	–	yes	yes
410-617	Verizon	BALTIMORE	–	yes	yes
410-618	IDT AMERICA, CORP. - MD	PERRYVILLE	2011-11-07	yes	yes
410-619	American Messaging	WATERLO236	–	–	yes
410-620	Verizon	ELKTON	–	yes	yes
410-621	Verizon	PRINCEANNE	–	yes	yes
410-622	Verizon	BALTIMORE	2011-08-12	yes	yes
410-623	Verizon	MARION	–	yes	yes
410-624	Verizon	BALTIMORE	–	yes	yes
410-625	Verizon	BALTIMORE	–	–	yes
410-626	Verizon	ANNAPOLIS	–	yes	yes
410-627	Verizon	BALTIMORE	–	–	yes
410-628	Verizon	COCKEYSVL	–	yes	yes
410-629	Verizon	BERLIN	–	yes	yes
410-630	Verizon	CHASE	–	yes	yes
410-631	Verizon	BALTIMORE	–	yes	yes
410-632	Verizon	SNOW HILL	–	yes	yes
410-633	Verizon	BALTIMORE	–	–	yes
410-634	Verizon	RIDGELY	–	yes	yes
410-635	Verizon	NEWWINDSOR	–	yes	yes
410-636	Verizon	BRYNPKLNCM	–	–	yes
410-637	Verizon	BALTIMORE	–	yes	yes
410-638	Verizon	BEL AIR	–	–	yes
410-639	Verizon	ROCK HALL	–	yes	yes
410-640	Spok	BALTIMORE	–	–	yes
410-641	Verizon	BERLIN	–	–	yes
410-642	Verizon	PERRYVILLE	–	yes	yes
410-643	Verizon	STEVENSVL	–	–	yes
410-644	Verizon	BALTIMORE	–	–	yes
410-645	Verizon	WOODLAWN	–	yes	yes
410-646	Verizon	BALTIMORE	–	yes	yes
410-647	Verizon	SEVERNA PK	–	–	yes
410-648	Verizon	GALENA	–	yes	yes
410-649	AT&T	BALTIMORE	–	yes	yes
410-650	Verizon	DUNDALK	–	yes	yes
410-651	Verizon	PRINCEANNE	–	–	yes
410-652	AT&T	BEL AIR	–	–	yes
410-653	Verizon	PIKESVILLE	–	–	yes
410-654	Verizon	PIKESVILLE	–	–	yes
410-655	Verizon	RANDALLSTN	–	–	yes
410-656	ARMSTRONG TELECOMMUNICATIONS, INC. - MD	NORTH EAST	2008-05-30	yes	yes
410-657	Verizon	PARKVILLE	–	yes	yes
410-658	ARMSTRONG TEL. CO. OF MARYLAND	RISING SUN	–	–	yes
410-659	Verizon	BALTIMORE	–	–	yes
410-660	T-Mobile	ELKRIDGE	2006-07-31	yes	yes
410-661	Verizon	PARKVILLE	–	–	yes
410-662	Verizon	BALTIMORE	–	yes	yes
410-663	Verizon	PARKVILLE	–	–	yes
410-664	Verizon	BALTIMORE	–	–	yes
410-665	Verizon	PARKVILLE	–	–	yes
410-666	Verizon	COCKEYSVL	–	–	yes
410-667	Verizon	COCKEYSVL	–	–	yes
410-668	Verizon	PARKVILLE	–	–	yes
410-669	Verizon	BALTIMORE	–	–	yes
410-670	Verizon	EDGEWOOD	–	yes	yes
410-671	Verizon	EDGEWOOD	–	yes	yes
410-672	Verizon	ODENTON	–	yes	yes
410-673	Verizon	PRESTON	–	yes	yes
410-674	Verizon	ODENTON	–	–	yes
410-675	Verizon	BALTIMORE	–	–	yes
410-676	Verizon	EDGEWOOD	–	–	yes
410-677	Verizon	SALISBURY	–	–	yes
410-678	Spok	ELKRIDGE	–	–	yes
410-679	Verizon	FORK	–	–	yes
410-680	Lumen	ELLICOTTCY	–	yes	yes
410-681	Spok	TOWSON	–	–	yes
410-682	Verizon	ESSEX	–	yes	yes
410-683	Verizon	COCKEYSVL	–	yes	yes
410-684	Verizon	GLENBURNIE	–	yes	yes
410-685	Verizon	BALTIMORE	–	–	yes
410-686	Verizon	ESSEX	–	–	yes
410-687	Verizon	ESSEX	–	–	yes
410-688	Verizon	FALLSTON	–	–	yes
410-689	AT&T	GLENBURNIE	–	yes	yes
410-690	Lumen	EASTON	2002-05-20	yes	yes
410-691	Verizon	GLENBURNIE	–	yes	yes
410-692	Verizon	JARRETTSVL	–	yes	yes
410-693	AT&T	ANNAPOLIS	–	–	yes
410-694	Verizon	GLENBURNIE	–	yes	yes
410-695	Verizon	ODENTON	–	yes	yes
410-696	Verizon	ELLICOTTCY	–	yes	yes
410-697	Verizon	MILLERSVL	–	yes	yes
410-698	Verizon	FORK	–	yes	yes
410-699	T-Mobile	CHESTERTN	2002-07-23	yes	yes
410-701	Verizon	RANDALLSTN	–	yes	yes
410-702	Verizon	REISTERSTN	–	yes	yes
410-703	Verizon	ANNAPOLIS	–	–	yes
410-704	Verizon	TOWSON	–	–	yes
410-705	Bandwidth	WATERLO236	–	yes	yes
410-706	Verizon	BALTIMORE	–	–	yes
410-707	Verizon	COLUMBIA	–	–	yes
410-708	Verizon	CHESTERTN	–	–	yes
410-709	Verizon	SPARROWSPT	–	yes	yes
410-710	T-Mobile	BALTIMORE	2005-10-03	yes	yes
410-712	Verizon	ELKRIDGE	–	–	yes
410-713	Lumen	SALISBURY	–	yes	yes
410-714	AT&T	EASTON	–	yes	yes
410-715	Verizon	COLUMBIA	–	–	yes
410-716	Verizon	TOWSON	–	yes	yes
410-717	Lumen	ELKRIDGE	–	yes	yes
410-718	AT&T	CATONSVL	–	yes	yes
410-719	Verizon	CATONSVL	–	–	yes
410-720	Verizon	ELLICOTTCY	–	yes	yes
410-721	Verizon	CROFTON	–	–	yes
410-722	Verizon	WATERLO236	–	–	yes
410-723	Verizon	OCEAN CITY	–	–	yes
410-724	Verizon	WATERLO236	–	yes	yes
410-725	T-Mobile	EASTON	–	yes	yes
410-726	Verizon	SALISBURY	–	–	yes
410-727	Verizon	BALTIMORE	–	–	yes
410-728	Verizon	BALTIMORE	–	–	yes
410-729	Verizon	SEVERN	–	yes	yes
410-730	Verizon	COLUMBIA	–	–	yes
410-731	Spok	ANNAPOLIS	–	–	yes
410-732	Verizon	BALTIMORE	–	–	yes
410-733	AT&T	CATONSVL	–	–	yes
410-734	Verizon	CHURCHVL	–	yes	yes
410-735	Windstream	BALTIMORE	–	yes	yes
410-736	Verizon	BALTIMORE	–	yes	yes
410-737	Verizon	ARBUTUS	–	–	yes
410-738	Verizon	WATERLO236	–	–	yes
410-739	AT&T	CENTREVL	–	yes	yes
410-740	Verizon	COLUMBIA	–	–	yes
410-741	Verizon	WEST RIVER	–	yes	yes
410-742	Verizon	SALISBURY	–	–	yes
410-743	Spok	BALTIMORE	–	–	yes
410-744	Verizon	CATONSVL	–	–	yes
410-745	Verizon	STMICHAELS	–	yes	yes
410-746	Verizon	BALTIMORE	–	–	yes
410-747	Verizon	CATONSVL	–	–	yes
410-748	Spok	ELLICOTTCY	–	–	yes
410-749	Verizon	SALISBURY	–	–	yes
410-750	Verizon	ELLICOTTCY	–	–	yes
410-751	Verizon	WESTMINSTR	–	–	yes
410-752	Verizon	BALTIMORE	–	–	yes
410-753	Verizon	PIKESVILLE	–	yes	yes
410-754	Verizon	FEDERALSBG	–	yes	yes
410-755	Verizon	WARWICK	–	yes	yes
410-756	Verizon	TANEYTOWN	–	yes	yes
410-757	Verizon	ANNAPOLIS	–	–	yes
410-758	Verizon	CENTREVL	–	yes	yes
410-759	AT&T	BALTIMORE	–	yes	yes
410-760	Verizon	GLENBURNIE	–	–	yes
410-761	Verizon	GLENBURNIE	–	–	yes
410-762	Verizon	GLENBURNIE	–	yes	yes
410-763	Verizon	EASTON	–	yes	yes
410-764	Verizon	BALTIMORE	–	–	yes
410-765	Verizon	GLENBURNIE	–	–	yes
410-766	Verizon	GLENBURNIE	–	–	yes
410-767	Verizon	BALTIMORE	–	–	yes
410-768	Verizon	GLENBURNIE	–	–	yes
410-769	Verizon	TOWSON	–	yes	yes
410-770	Verizon	EASTON	–	yes	yes
410-771	Verizon	COCKEYSVL	–	–	yes
410-772	Verizon	COLUMBIA	–	yes	yes
410-773	Verizon	COCKEYSVL	–	yes	yes
410-774	Verizon	CROFTON	–	yes	yes
410-775	Verizon	UNION BDG	–	yes	yes
410-776	AT&T	BEL AIR	–	yes	yes
410-777	Verizon	SEVERNA PK	–	yes	yes
410-778	Verizon	CHESTERTN	–	–	yes
410-779	Lumen	BALTIMORE	–	yes	yes
410-780	Verizon	ESSEX	–	–	yes
410-781	Verizon	ELLICOTTCY	–	yes	yes
410-782	Verizon	ELKRIDGE	–	yes	yes
410-783	Verizon	BALTIMORE	–	–	yes
410-784	Verizon	DEALISLAND	–	yes	yes
410-785	Verizon	COCKEYSVL	–	–	yes
410-786	Verizon	WOODLAWN	–	–	yes
410-787	Verizon	GLENBURNIE	–	–	yes
410-788	Verizon	CATONSVL	–	–	yes
410-789	Verizon	BRYNPKLNCM	–	–	yes
410-790	AT&T	TOWSON	–	–	yes
410-791	Verizon	WATERLO236	–	–	yes
410-792	Verizon	WATERLO236	–	–	yes
410-793	Verizon	SEVERNA PK	–	yes	yes
410-794	Lumen	COLUMBIA	–	yes	yes
410-795	Verizon	SYKESVILLE	–	–	yes
410-796	Verizon	ELKRIDGE	–	yes	yes
410-797	Verizon	WATERLO236	–	–	yes
410-798	Verizon	WEST RIVER	–	–	yes
410-799	Verizon	WATERLO238	–	–	yes
410-800	Verizon	BALTIMORE	2004-10-05	yes	yes
410-801	Verizon	BALTIMORE	–	yes	yes
410-802	AT&T	CATONSVL	–	–	yes
410-803	Verizon	FORK	–	yes	yes
410-804	Verizon	BALTIMORE	–	–	yes
410-805	T-Mobile	BALTIMORE	2011-08-25	yes	yes
410-806	Spok	TOWSON	–	–	yes
410-807	Lumen	CATONSVL	–	yes	yes
410-808	T-Mobile	FALLSTON	–	yes	yes
410-809	Windstream	BEL AIR	–	yes	yes
410-810	Verizon	CHESTERTN	–	yes	yes
410-812	AT&T	TOWSON	–	–	yes
410-813	Verizon	WATERLO236	–	–	yes
410-814	Windstream	BALTIMORE	2005-09-30	yes	yes
410-815	Verizon	WATERLO236	–	–	yes
410-816	Verizon	TOWSON	–	yes	yes
410-817	Verizon	FORK	–	yes	yes
410-818	AT&T	CATONSVL	–	yes	yes
410-819	Verizon	EASTON	–	yes	yes
410-820	Verizon	EASTON	–	–	yes
410-821	Verizon	TOWSON	–	–	yes
410-822	Verizon	EASTON	–	–	yes
410-823	Verizon	TOWSON	–	–	yes
410-824	Lumen	WATERLO236	–	yes	yes
410-825	Verizon	TOWSON	–	–	yes
410-826	Onvoy	BALTIMORE	2015-11-19	yes	yes
410-827	Verizon	QUEENSTOWN	–	yes	yes
410-828	Verizon	TOWSON	–	–	yes
410-829	Verizon	EASTON	–	yes	yes
410-830	Verizon	TOWSON	–	yes	yes
410-831	T-Mobile	SALISBURY	–	yes	yes
410-832	Verizon	TOWSON	–	yes	yes
410-833	Verizon	REISTERSTN	–	–	yes
410-834	Lumen	WATERLO236	–	yes	yes
410-835	Verizon	WILLARDS	–	yes	yes
410-836	Verizon	BEL AIR	–	–	yes
410-837	Verizon	BALTIMORE	–	–	yes
410-838	Verizon	BEL AIR	–	–	yes
410-839	Spok	TOWSON	–	–	yes
410-840	Verizon	REISTERSTN	–	yes	yes
410-841	Verizon	SEVERNA PK	–	yes	yes
410-842	Verizon	TOWSON	–	yes	yes
410-843	AT&T	BALTIMORE	–	–	yes
410-844	Peerless	BALTIMORE	2011-09-30	yes	yes
410-845	T-Mobile	SALISBURY	2001-04-18	yes	yes
410-846	Verizon	SEVERN	–	yes	yes
410-847	Verizon	TOWSON	–	yes	yes
410-848	Verizon	WESTMINSTR	–	–	yes
410-849	Verizon	SHERWD FOR	–	yes	yes
410-850	Verizon	GLENBURNIE	–	–	yes
410-851	Verizon	TOWSON	–	–	yes
410-852	AT&T	CATONSVL	–	–	yes
410-853	Verizon	TOWSON	–	yes	yes
410-854	Verizon	WATERLO236	–	–	yes
410-855	Verizon	GLENBURNIE	–	yes	yes
410-856	Verizon	BALTIMORE	–	yes	yes
410-857	Verizon	WESTMINSTR	–	–	yes
410-858	Verizon	ANNAPOLIS	2005-03-11	yes	yes
410-859	Verizon	GLENBURNIE	–	–	yes
410-860	Verizon	SALISBURY	–	–	yes
410-861	Verizon	WESTMINSTR	–	yes	yes
410-862	Onvoy	WATERLO236	–	yes	yes
410-863	Verizon	GLENBURNIE	–	yes	yes
410-864	Verizon	BALTIMORE	–	yes	yes
410-865	Verizon	GLENBURNIE	–	yes	yes
410-866	Verizon	ESSEX	–	–	yes
410-867	Verizon	WEST RIVER	–	yes	yes
410-868	AT&T	CATONSVL	–	–	yes
410-869	Verizon	CATONSVL	–	yes	yes
410-870	Comcast	PARKVILLE	2005-02-10	yes	yes
410-871	Verizon	WESTMINSTR	–	yes	yes
410-872	Verizon	COLUMBIA	–	–	yes
410-873	Verizon	NANTICOKE	–	yes	yes
410-874	Verizon	ODENTON	–	yes	yes
410-875	Verizon	SYKESVILLE	–	yes	yes
410-876	Verizon	REISTERSTN	–	–	yes
410-877	Verizon	FALLSTON	–	yes	yes
410-878	Verizon	BALTIMORE	–	yes	yes
410-879	Verizon	FORK	–	–	yes
410-880	Verizon	WATERLO236	–	–	yes
410-881	Verizon	SHERWD FOR	–	yes	yes
410-882	Verizon	PARKVILLE	–	–	yes
410-883	Verizon	SHARPTOWN	–	yes	yes
410-884	Verizon	COLUMBIA	–	–	yes
410-885	Verizon	CHESAPKECY	–	yes	yes
410-886	Verizon	TILGHMAN	–	yes	yes
410-887	Verizon	TOWSON	–	–	yes
410-888	Verizon	WATERLO236	–	yes	yes
410-889	Verizon	BALTIMORE	–	–	yes
410-890	Spok	TOWSON	–	–	yes
410-891	Verizon	COCKEYSVL	–	yes	yes
410-892	Verizon	GLENBURNIE	–	yes	yes
410-893	Verizon	FORK	–	–	yes
410-894	Spok	TOWSON	–	–	yes
410-895	Verizon	BALTIMORE	–	–	yes
410-896	Verizon	DELMAR	–	yes	yes
410-897	Verizon	ANNAPOLIS	–	yes	yes
410-898	Verizon	WATERLO236	–	–	yes
410-899	Spok	TOWSON	–	–	yes
410-900	Windstream	BALTIMORE	2004-10-04	yes	yes
410-901	Verizon	CAMBRIDGE	–	yes	yes
410-902	Verizon	PIKESVILLE	–	–	yes
410-903	T-Mobile	SEVERNA PK	–	yes	yes
410-904	Verizon	WATERLO238	–	yes	yes
410-905	T-Mobile	BALTIMORE	–	yes	yes
410-906	Verizon	BALTIMORE	–	–	yes
410-907	Verizon	WOODLAWN	–	yes	yes
410-908	T-Mobile	BALTIMORE	–	yes	yes
410-909	Spok	ELKRIDGE	–	–	yes
410-910	Verizon	COLUMBIA	–	–	yes
410-912	Windstream	SALISBURY	–	–	yes
410-913	Verizon	BALTIMORE	–	–	yes
410-914	Windstream	CHURCHVL	–	yes	yes
410-915	BALTIMORE-WASHINGTON TELEPHONE (BWT)	BALTIMORE	2005-10-27	–	yes
410-916	Verizon	BALTIMORE	–	–	yes
410-917	AT&T	CATONSVL	–	–	yes
410-918	Verizon	ESSEX	–	yes	yes
410-919	Verizon	ANNAPOLIS	–	yes	yes
410-920	AT&T	ELKTON	–	–	yes
410-921	Lumen	SEVERN	–	yes	yes
410-922	Verizon	RANDALLSTN	–	–	yes
410-923	Verizon	MILLERSVL	–	–	yes
410-924	Verizon	EASTON	–	–	yes
410-925	Verizon	BALTIMORE	–	–	yes
410-926	AT&T	CATONSVL	–	yes	yes
410-927	Lumen	ODENTON	–	yes	yes
410-928	Verizon	MILLINGTON	–	yes	yes
410-929	Bandwidth	BALTIMORE	2008-05-13	yes	yes
410-930	REDI-CALL COMMUNICATIONS CO.	WATERLO236	–	–	yes
410-931	Verizon	PARKVILLE	–	–	yes
410-932	Spok	ELKRIDGE	–	–	yes
410-933	Verizon	PARKVILLE	–	–	yes
410-934	AT&T	ANNAPOLIS	2012-01-27	yes	yes
410-935	Verizon	BALTIMORE	–	–	yes
410-936	Comcast	SALISBURY	2019-06-04	yes	yes
410-937	Verizon	FALLSTON	–	–	yes
410-938	Verizon	TOWSON	–	yes	yes
410-939	Verizon	HAVREGRACE	–	–	yes
410-940	Windstream	ANNAPOLIS	2002-01-22	yes	yes
410-941	Verizon	JARRETTSVL	2001-08-21	yes	yes
410-942	Verizon	HAVREGRACE	–	yes	yes
410-943	Verizon	HURLOCK	–	yes	yes
410-944	Verizon	WOODLAWN	–	–	yes
410-945	Verizon	BALTIMORE	–	–	yes
410-946	Verizon	SEVERNA PK	–	yes	yes
410-947	Verizon	BALTIMORE	–	–	yes
410-948	AT&T	CATONSVL	–	yes	yes
410-949	Verizon	BALTIMORE	–	yes	yes
410-951	AT&T	BALTIMORE	–	–	yes
410-952	Verizon	BALTIMORE	–	–	yes
410-953	Verizon	COLUMBIA	–	yes	yes
410-955	Verizon	BALTIMORE	–	–	yes
410-956	Verizon	ANNAPOLIS	–	–	yes
410-957	Verizon	POCOMOKE	–	yes	yes
410-960	Verizon	BALTIMORE	–	–	yes
410-961	T-Mobile	BALTIMORE	–	yes	yes
410-962	Verizon	BALTIMORE	–	–	yes
410-963	T-Mobile	BALTIMORE	–	yes	yes
410-964	Verizon	COLUMBIA	–	–	yes
410-965	Verizon	WOODLAWN	–	–	yes
410-966	Verizon	WOODLAWN	–	–	yes
410-967	AT&T	TOWSON	–	–	yes
410-968	Verizon	CRISFIELD	–	yes	yes
410-969	Verizon	SEVERN	–	–	yes
410-970	Verizon	SYKESVILLE	–	yes	yes
410-971	AT&T	CATONSVL	–	–	yes
410-972	AT&T	ANNAPOLIS	–	yes	yes
410-973	MCC TELEPHONY OF THE MID-ATLANTIC, LLC - MD	BERLIN	2010-06-23	yes	yes
410-974	Verizon	SEVERNA PK	–	–	yes
410-975	Verizon	SEVERNA PK	–	yes	yes
410-977	T-Mobile	BALTIMORE	–	yes	yes
410-978	AT&T	CATONSVL	–	–	yes
410-979	AT&T	CATONSVL	–	–	yes
410-980	Verizon	ANNAPOLIS	–	yes	yes
410-981	Verizon	GLENBURNIE	–	yes	yes
410-982	QUANTUM TELECOMMUNICATIONS, INC. - MD	BALTIMORE	2003-10-13	yes	yes
410-983	Verizon	FORK	–	yes	yes
410-984	T-Mobile	SYKESVILLE	–	yes	yes
410-985	BALTIMORE-WASHINGTON TELEPHONE (BWT)	WATERLO236	–	–	yes
410-986	Verizon	BALTIMORE	–	–	yes
410-987	Verizon	SEVERN	–	–	yes
410-988	Verizon	ELLICOTTCY	–	yes	yes
410-989	Verizon	FORK	–	yes	yes
410-990	Verizon	ANNAPOLIS	–	–	yes
410-991	Verizon	ANNAPOLIS	–	–	yes
410-992	Verizon	COLUMBIA	–	yes	yes
410-993	Verizon	GLENBURNIE	–	–	yes
410-994	Verizon	EDGEWOOD	–	yes	yes
410-995	Verizon	ELLICOTTCY	–	yes	yes
410-996	Verizon	ELKTON	–	yes	yes
410-997	Verizon	COLUMBIA	–	–	yes
410-998	Verizon	PIKESVILLE	–	yes	yes
410-999	BALTIMORE-WASHINGTON TELEPHONE (BWT)	GLENBURNIE	2003-06-09	yes	yes

Frequently asked

How many prefixes does area code 410 have?

783 NXX blocks are assigned of 786 possible. Each block is 10,000 consecutive numbers, so the code currently covers about 7,830 thousand-number ranges across 102 rate centers.

What do the first three digits after 410 tell me?

They identify the block, which tells you the rate center it was allocated to and the carrier that received it. They do not tell you who serves the number today: portability moves numbers between carriers, and pooling splits a block between several of them.

Is a 410 prefix tied to a specific town?

To a rate center, which is billing geography rather than a town. NANPA abbreviates rate center names to ten characters and in large metros uses zone codes, so the name is a NANPA label, not a place name.

What does “pooled” mean in the 410 table?

That the block is in thousands-block pooling: carriers draw 1,000-number lots from it instead of taking all 10,000. 377 of 410's blocks are pooled, which is how regulators slowed down area code exhaustion – and why one prefix can belong to several carriers.

Source and limits

NANPA CO Code Assignment Records, all states, utilized codes, file updated 11/01/2026 – the rows where the record's Use field is “AS” (assigned). Unavailable codes are excluded. The records say who received a block and when, not who serves a particular number today.

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