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

OAKLAND prefixes in area code 240

NANPA records 6 assigned NXX blocks to rate center OAKLAND in area code 240, 0.8% 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. 6 holders hold those blocks, the largest being CORE COMMUNICATIONS, INC.- MD (1), ONVOY, LLC - MD (1), USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD (1). The earliest assignment on record here is 2001-05-22 and the most recent 2021-07-20. 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 201, 207, 217, 227 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 0.8% of 240
6 holders of record
5 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
240-212 CORE COMMUNICATIONS, INC.- MD – no yes
240-226 Onvoy ONVOY, LLC - MD 2020-07-16 yes yes
240-321 UScellular USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD – yes yes
240-442 Verizon VERIZON MARYLAND, INC. 2001-05-22 yes yes
240-488 SHENTEL COMMUNICATIONS, LLC. - MD 2012-05-16 yes yes
240-785 Bandwidth BANDWIDTH.COM CLEC, LLC - MD 2021-07-20 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
CORE COMMUNICATIONS, INC.- MD – 1 16.7%
ONVOY, LLC - MD Onvoy 1 16.7%
USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD UScellular 1 16.7%
VERIZON MARYLAND, INC. Verizon 1 16.7%
SHENTEL COMMUNICATIONS, LLC. - MD – 1 16.7%
BANDWIDTH.COM CLEC, LLC - MD Bandwidth 1 16.7%

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 OAKLAND in area code 240?

6 blocks: 212, 226, 321, 442, 488, 785. The table above gives the holder of each.

Which carriers have numbers in OAKLAND?

CORE COMMUNICATIONS, INC.- MD (1 block), ONVOY, LLC - MD (1 block), USCOC OF CUMBERLAND, INC. DBA UNITED STATES CEL MD (1 block), VERIZON MARYLAND, INC. (1 block), SHENTEL COMMUNICATIONS, LLC. - MD (1 block), BANDWIDTH.COM CLEC, LLC - 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 OAKLAND 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