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

GRANTSVL prefixes in area code 240

NANPA records 3 assigned NXX blocks to rate center GRANTSVL in area code 240, 0.4% 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. 3 holders hold those blocks, the largest being CORE COMMUNICATIONS, INC.- MD (1), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1), LEVEL 3 COMMUNICATIONS, LLC - MD (1). The earliest assignment on record here is 2018-02-01 and the most recent 2019-05-30. 2 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, 301, 304, 681 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 240
3 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
240-275 CORE COMMUNICATIONS, INC.- MD – no yes
240-588 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2018-02-01 yes yes
240-692 Lumen LEVEL 3 COMMUNICATIONS, LLC - MD 2019-05-30 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 33.3%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 33.3%
LEVEL 3 COMMUNICATIONS, LLC - MD Lumen 1 33.3%

Frequently asked

Which prefixes belong to GRANTSVL in area code 240?

3 blocks: 275, 588, 692. The table above gives the holder of each.

Which carriers have numbers in GRANTSVL?

CORE COMMUNICATIONS, INC.- MD (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES LLC (1 block), LEVEL 3 COMMUNICATIONS, 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 GRANTSVL 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