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

GRANITEFLS prefixes in area code 320

NANPA records 7 assigned NXX blocks to rate center GRANITEFLS in area code 320, 1.4% 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. 5 holders hold those blocks, the largest being LEVEL 3 COMMUNICATIONS, LLC - MN (2), CENTURYLINK OF MINNESOTA, INC. (2), ONVOY, LLC - MN (1). The earliest assignment on record here is 2003-05-14 and the most recent 2010-03-17. 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 code 828 – overlay codes cover the same geography, so a rate center is served by all of them.

7 assigned blocks – 1.4% of 320
5 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
320-313 Onvoy ONVOY, LLC - MN 2003-05-14 yes yes
320-315 Lumen LEVEL 3 COMMUNICATIONS, LLC - MN 2003-09-22 yes yes
320-338 Lumen LEVEL 3 COMMUNICATIONS, LLC - MN 2004-06-08 yes yes
320-379 MCC TELEPHONY OF MINNESOTA, LLC - MN 2010-03-17 yes yes
320-564 Lumen CENTURYLINK OF MINNESOTA, INC. – no yes
320-722 Lumen CENTURYLINK OF MINNESOTA, INC. 2006-05-15 yes yes
320-981 AT&T NEW CINGULAR WIRELESS PCS, LLC - IL – 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
LEVEL 3 COMMUNICATIONS, LLC - MN Lumen 2 28.6%
CENTURYLINK OF MINNESOTA, INC. Lumen 2 28.6%
ONVOY, LLC - MN Onvoy 1 14.3%
MCC TELEPHONY OF MINNESOTA, LLC - MN – 1 14.3%
NEW CINGULAR WIRELESS PCS, LLC - IL AT&T 1 14.3%

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 GRANITEFLS in area code 320?

7 blocks: 313, 315, 338, 379, 564, 722, 981. The table above gives the holder of each.

Which carriers have numbers in GRANITEFLS?

LEVEL 3 COMMUNICATIONS, LLC - MN (2 blocks), CENTURYLINK OF MINNESOTA, INC. (2 blocks), ONVOY, LLC - MN (1 block), MCC TELEPHONY OF MINNESOTA, LLC - MN (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 GRANITEFLS 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