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

MILTON prefixes in area code 857

NANPA records 4 assigned NXX blocks to rate center MILTON in area code 857, 1.1% of the 361 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. 4 holders hold those blocks, the largest being COMCAST IP PHONE, LLC (1), BANDWIDTH.COM CLEC, LLC - MA (1), NEW CINGULAR WIRELESS PCS, LLC - DC (1). The earliest assignment on record here is 2001-03-20 and the most recent 2016-08-08. 4 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 209, 217, 272, 302 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 1.1% of 857
4 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
857-267 Comcast COMCAST IP PHONE, LLC 2013-07-15 yes yes
857-314 Bandwidth BANDWIDTH.COM CLEC, LLC - MA 2015-01-28 yes yes
857-419 AT&T NEW CINGULAR WIRELESS PCS, LLC - DC 2016-08-08 yes yes
857-598 Verizon MCIMETRO ACCESS TRANSMISSION SERVICES LLC 2001-03-20 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
COMCAST IP PHONE, LLC Comcast 1 25%
BANDWIDTH.COM CLEC, LLC - MA Bandwidth 1 25%
NEW CINGULAR WIRELESS PCS, LLC - DC AT&T 1 25%
MCIMETRO ACCESS TRANSMISSION SERVICES LLC Verizon 1 25%

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 MILTON in area code 857?

4 blocks: 267, 314, 419, 598. The table above gives the holder of each.

Which carriers have numbers in MILTON?

COMCAST IP PHONE, LLC (1 block), BANDWIDTH.COM CLEC, LLC - MA (1 block), NEW CINGULAR WIRELESS PCS, LLC - DC (1 block), MCIMETRO ACCESS TRANSMISSION SERVICES 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 MILTON 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 857

All 361 prefixes in 857