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

CROSWELL prefixes in area code 810

NANPA records 4 assigned NXX blocks to rate center CROSWELL in area code 810, 0.8% of the 509 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 MICHIGAN BELL TEL CO (2), TELEPORT COMMUNICATIONS AMERICA, LLC - MI (1), NEW CINGULAR WIRELESS PCS, LLC - IL (1). 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.8% of 810
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
810-546 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - MI – yes yes
810-679 AT&T MICHIGAN BELL TEL CO – yes yes
810-712 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – yes yes
810-878 AT&T MICHIGAN BELL TEL CO – 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
MICHIGAN BELL TEL CO AT&T 2 50%
TELEPORT COMMUNICATIONS AMERICA, LLC - MI AT&T 1 25%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 25%

Frequently asked

Which prefixes belong to CROSWELL in area code 810?

4 blocks: 546, 679, 712, 878. The table above gives the holder of each.

Which carriers have numbers in CROSWELL?

MICHIGAN BELL TEL CO (2 blocks), TELEPORT COMMUNICATIONS AMERICA, LLC - MI (1 block), NEW CINGULAR WIRELESS PCS, LLC - IL (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is CROSWELL 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 810

All 509 prefixes in 810