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

MERRIMAC prefixes in area code 351

NANPA records 3 assigned NXX blocks to rate center MERRIMAC in area code 351, 3.3% of the 91 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. 2 holders hold those blocks, the largest being ONVOY, LLC - MA (2), FRACTEL, LLC (1). The earliest assignment on record here is 2019-10-10 and the most recent 2020-05-08. 3 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 608, 978 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 3.3% of 351
2 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
351-222 Onvoy ONVOY, LLC - MA 2019-10-10 yes yes
351-529 FRACTEL, LLC 2020-05-08 yes yes
351-888 Onvoy ONVOY, LLC - MA – 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 - MA Onvoy 2 66.7%
FRACTEL, LLC – 1 33.3%

Frequently asked

Which prefixes belong to MERRIMAC in area code 351?

3 blocks: 222, 529, 888. The table above gives the holder of each.

Which carriers have numbers in MERRIMAC?

ONVOY, LLC - MA (2 blocks), FRACTEL, 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 MERRIMAC 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 351

All 91 prefixes in 351