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

LEONARDTN prefixes in area code 301

NANPA records 9 assigned NXX blocks to rate center LEONARDTN in area code 301, 1.1% 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. 5 holders hold those blocks, the largest being VERIZON MARYLAND, INC. (4), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (2), NEW CINGULAR WIRELESS PCS, LLC - DC (1). The earliest assignment on record here is 2007-05-23 and the most recent 2007-05-23. 5 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 227, 240 – overlay codes cover the same geography, so a rate center is served by all of them.

9 assigned blocks – 1.1% of 301
5 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
301-247 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC – no yes
301-373 Verizon VERIZON MARYLAND, INC. – yes yes
301-475 Verizon VERIZON MARYLAND, INC. – no yes
301-481 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD – no yes
301-536 T-Mobile METROPCS, INC. – yes yes
301-690 IDT AMERICA, CORP. - MD 2007-05-23 yes yes
301-769 Verizon VERIZON MARYLAND, INC. – yes yes
301-904 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD – no yes
301-997 Verizon VERIZON MARYLAND, INC. – 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
VERIZON MARYLAND, INC. Verizon 4 44.4%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD Verizon 2 22.2%
NEW CINGULAR WIRELESS PCS, LLC - DC AT&T 1 11.1%
METROPCS, INC. T-Mobile 1 11.1%
IDT AMERICA, CORP. - MD – 1 11.1%

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 LEONARDTN in area code 301?

9 blocks: 247, 373, 475, 481, 536, 690, 769, 904, 997. The table above gives the holder of each.

Which carriers have numbers in LEONARDTN?

VERIZON MARYLAND, INC. (4 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (2 blocks), NEW CINGULAR WIRELESS PCS, LLC - DC (1 block), METROPCS, INC. (1 block), IDT AMERICA, CORP. - MD (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is LEONARDTN 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 301

All 784 prefixes in 301