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

NANJEMOY prefixes in area code 240

NANPA records 5 assigned NXX blocks to rate center NANJEMOY in area code 240, 0.6% of the 785 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. 4 holders hold those blocks, the largest being ONVOY, LLC - MD (2), PEERLESS NETWORK OF MARYLAND, LLC (1), TELEPORT COMMUNICATIONS AMERICA, LLC - DC (1). The earliest assignment on record here is 2021-04-22 and the most recent 2021-04-22. 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 code 301 – overlay codes cover the same geography, so a rate center is served by all of them.

5 assigned blocks – 0.6% of 240
4 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
240-218 Peerless PEERLESS NETWORK OF MARYLAND, LLC – yes yes
240-257 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - DC – yes yes
240-666 Onvoy ONVOY, LLC - MD – yes yes
240-768 Charter ONVOY SPECTRUM, LLC 2021-04-22 yes yes
240-986 Onvoy ONVOY, LLC - MD – 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
ONVOY, LLC - MD Onvoy 2 40%
PEERLESS NETWORK OF MARYLAND, LLC Peerless 1 20%
TELEPORT COMMUNICATIONS AMERICA, LLC - DC AT&T 1 20%
ONVOY SPECTRUM, LLC Charter 1 20%

Frequently asked

Which prefixes belong to NANJEMOY in area code 240?

5 blocks: 218, 257, 666, 768, 986. The table above gives the holder of each.

Which carriers have numbers in NANJEMOY?

ONVOY, LLC - MD (2 blocks), PEERLESS NETWORK OF MARYLAND, LLC (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - DC (1 block), ONVOY SPECTRUM, LLC (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is NANJEMOY 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 240

All 785 prefixes in 240