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

MIDDLEBORO prefixes in area code 508

NANPA records 3 assigned NXX blocks to rate center MIDDLEBORO in area code 508, 0.4% of the 749 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. 1 holder holds those blocks, the largest being VERIZON NEW ENGLAND INC. (3). 1 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 774 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 508
1 holders of record
1 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
508-923 Verizon VERIZON NEW ENGLAND INC. – yes yes
508-946 Verizon VERIZON NEW ENGLAND INC. – no yes
508-947 Verizon VERIZON NEW ENGLAND INC. – no 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.

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 MIDDLEBORO in area code 508?

3 blocks: 923, 946, 947. The table above gives the holder of each.

Which carriers have numbers in MIDDLEBORO?

VERIZON NEW ENGLAND INC. (3 blocks). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is MIDDLEBORO 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 508

All 749 prefixes in 508