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

STANFORD prefixes in area code 309

NANPA records 3 assigned NXX blocks to rate center STANFORD in area code 309, 0.4% of the 786 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 VONAGE AMERICA LLC (1), FRONTIER NORTH, INC. - IL (1), ONVOY, LLC (1). The earliest assignment on record here is 2018-08-01 and the most recent 2023-06-26. 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 406, 606, 812, 930 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 309
3 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
309-332 Vonage VONAGE AMERICA LLC 2018-08-01 yes yes
309-379 Frontier FRONTIER NORTH, INC. - IL – yes yes
309-815 Onvoy ONVOY, LLC 2023-06-26 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
VONAGE AMERICA LLC Vonage 1 33.3%
FRONTIER NORTH, INC. - IL Frontier 1 33.3%
ONVOY, LLC Onvoy 1 33.3%

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 STANFORD in area code 309?

3 blocks: 332, 379, 815. The table above gives the holder of each.

Which carriers have numbers in STANFORD?

VONAGE AMERICA LLC (1 block), FRONTIER NORTH, INC. - IL (1 block), ONVOY, 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 STANFORD 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 309

All 786 prefixes in 309