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

STRATFORD prefixes in area code 559

NANPA records 6 assigned NXX blocks to rate center STRATFORD in area code 559, 0.8% 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. 6 holders hold those blocks, the largest being COMCAST PHONE OF CALIFORNIA, LLC (1), IP HORIZON LLC (1), LEVEL 3 COMMUNICATIONS, LLC - CA (1). The earliest assignment on record here is 2021-06-23 and the most recent 2021-06-23. 6 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 515, 580, 715, 806 – overlay codes cover the same geography, so a rate center is served by all of them.

6 assigned blocks – 0.8% of 559
6 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
559-343 Comcast COMCAST PHONE OF CALIFORNIA, LLC – yes yes
559-463 IP HORIZON LLC – yes yes
559-526 Lumen LEVEL 3 COMMUNICATIONS, LLC - CA – yes yes
559-609 Telnyx TELNYX LLC 2021-06-23 yes yes
559-927 Lumen LEVEL 3 TELECOM OF CALIFORNIA, LP - CA – yes yes
559-947 AT&T PACIFIC BELL – 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 PHONE OF CALIFORNIA, LLC Comcast 1 16.7%
IP HORIZON LLC – 1 16.7%
LEVEL 3 COMMUNICATIONS, LLC - CA Lumen 1 16.7%
TELNYX LLC Telnyx 1 16.7%
LEVEL 3 TELECOM OF CALIFORNIA, LP - CA Lumen 1 16.7%
PACIFIC BELL AT&T 1 16.7%

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 STRATFORD in area code 559?

6 blocks: 343, 463, 526, 609, 927, 947. The table above gives the holder of each.

Which carriers have numbers in STRATFORD?

COMCAST PHONE OF CALIFORNIA, LLC (1 block), IP HORIZON LLC (1 block), LEVEL 3 COMMUNICATIONS, LLC - CA (1 block), TELNYX LLC (1 block), LEVEL 3 TELECOM OF CALIFORNIA, LP - CA (1 block), PACIFIC BELL (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is STRATFORD 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 559

All 785 prefixes in 559