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

COLDSPRING prefixes in area code 320

NANPA records 4 assigned NXX blocks to rate center COLDSPRING in area code 320, 0.8% of the 511 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 ONVOY, LLC - MN (1), ONVOY SPECTRUM, LLC (1), QWEST CORPORATION (1). The earliest assignment on record here is 2007-03-13 and the most recent 2024-02-12. 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 845, 936 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 0.8% of 320
4 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
320-348 Onvoy ONVOY, LLC - MN 2007-03-13 yes yes
320-600 Charter ONVOY SPECTRUM, LLC 2024-02-12 yes yes
320-685 Lumen QWEST CORPORATION – yes yes
320-686 SKYE TELECOM LLC DBA SKYETEL – 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
ONVOY, LLC - MN Onvoy 1 25%
ONVOY SPECTRUM, LLC Charter 1 25%
QWEST CORPORATION Lumen 1 25%
SKYE TELECOM LLC DBA SKYETEL – 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 COLDSPRING in area code 320?

4 blocks: 348, 600, 685, 686. The table above gives the holder of each.

Which carriers have numbers in COLDSPRING?

ONVOY, LLC - MN (1 block), ONVOY SPECTRUM, LLC (1 block), QWEST CORPORATION (1 block), SKYE TELECOM LLC DBA SKYETEL (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is COLDSPRING 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 320

All 511 prefixes in 320