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

DANBURY prefixes in area code 203

NANPA records 54 assigned NXX blocks to rate center DANBURY in area code 203, 6.9% of the 784 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 11 holders hold those blocks, the largest being SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (25), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT (9), OMNIPOINT COMMUNICATIONS, INC. - CT (6). The earliest assignment on record here is 2001-03-23 and the most recent 2011-12-06. 30 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area codes 308, 336, 475, 603 – overlay codes cover the same geography, so a rate center is served by all of them.

54 assigned blocks – 6.9% of 203
11 holders of record
30 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
203-205 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-207 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-240 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT – no yes
203-241 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT – no yes
203-289 Spok SPOK, INC. – no yes
203-297 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT – yes yes
203-300 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT 2001-10-25 yes yes
203-312 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-313 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT – yes yes
203-417 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes
203-448 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT – yes yes
203-456 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 2011-12-06 yes yes
203-460 T-Mobile METROPCS, INC. – yes yes
203-470 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT – no yes
203-482 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2001-03-23 yes yes
203-501 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 2010-07-09 yes yes
203-512 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT – no yes
203-546 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - CT – yes yes
203-616 Lumen LEVEL 3 COMMUNICATIONS, LLC - CT – yes yes
203-617 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT 2006-09-05 yes yes
203-628 Altice CABLEVISION LIGHTPATH, INC. - CT – yes yes
203-648 Lumen LEVEL 3 COMMUNICATIONS, LLC - CT – yes yes
203-702 Windstream PAETEC ITEL, LLC – yes yes
203-730 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-731 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-733 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT – no yes
203-739 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-740 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-743 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-744 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-746 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-748 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-749 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-770 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes
203-775 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-778 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-788 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes
203-790 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-791 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-792 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-794 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-796 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-797 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-798 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-825 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – no yes
203-826 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-830 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-837 AT&T SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT – yes yes
203-885 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 2006-10-30 yes yes
203-917 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 2008-10-22 yes yes
203-942 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT – yes yes
203-947 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – yes yes
203-948 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT – yes yes
203-994 T-Mobile OMNIPOINT COMMUNICATIONS, INC. - CT 2001-12-14 yes yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT AT&T 25 46.3%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT Verizon 9 16.7%
OMNIPOINT COMMUNICATIONS, INC. - CT T-Mobile 6 11.1%
NEW CINGULAR WIRELESS PCS, LLC - DC AT&T 5 9.3%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT Verizon 2 3.7%
LEVEL 3 COMMUNICATIONS, LLC - CT Lumen 2 3.7%
SPOK, INC. Spok 1 1.9%
METROPCS, INC. T-Mobile 1 1.9%
TELEPORT COMMUNICATIONS AMERICA, LLC - CT AT&T 1 1.9%
CABLEVISION LIGHTPATH, INC. - CT Altice 1 1.9%
PAETEC ITEL, LLC Windstream 1 1.9%

Same rate center in other codes

Overlay codes cover the same geography, so one rate center is served by all of them.

Frequently asked

Which prefixes belong to DANBURY in area code 203?

54 blocks: 205, 207, 240, 241, 289, 297, 300, 312, 313, 417, 448, 456 and 42 more, all listed in the table above.

Which carriers have numbers in DANBURY?

SOUTHERN NEW ENGLAND TELCO DBA FRONTIER COMM OF CT (25 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT (9 blocks), OMNIPOINT COMMUNICATIONS, INC. - CT (6 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (5 blocks), MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CT (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - CT (2 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is DANBURY a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 203

All 784 prefixes in 203