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

GRINNELL prefixes in area code 641

NANPA records 9 assigned NXX blocks to rate center GRINNELL in area code 641, 1.5% of the 584 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 WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH (3), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA (2), UNITED STATES CELLULAR - IA (2). The earliest assignment on record here is 2015-06-25 and the most recent 2015-06-25. 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 785 – overlay codes cover the same geography, so a rate center is served by all of them.

9 assigned blocks – 1.5% of 641
5 holders of record
6 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
641-236 Windstream WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH – no yes
641-260 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA – yes yes
641-269 Windstream WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH – no yes
641-325 UNITED STATES CELLULAR - IA – yes yes
641-510 T-Mobile T-MOBILE USA, INC. – no yes
641-659 Windstream WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 2015-06-25 yes yes
641-821 T-Mobile METROPCS, INC. – yes yes
641-888 Verizon CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA – yes yes
641-990 UNITED STATES CELLULAR - IA – 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
WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH Windstream 3 33.3%
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA Verizon 2 22.2%
UNITED STATES CELLULAR - IA – 2 22.2%
T-MOBILE USA, INC. T-Mobile 1 11.1%
METROPCS, INC. T-Mobile 1 11.1%

Frequently asked

Which prefixes belong to GRINNELL in area code 641?

9 blocks: 236, 260, 269, 325, 510, 659, 821, 888, 990. The table above gives the holder of each.

Which carriers have numbers in GRINNELL?

WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH (3 blocks), CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA (2 blocks), UNITED STATES CELLULAR - IA (2 blocks), T-MOBILE USA, INC. (1 block), METROPCS, INC. (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is GRINNELL 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 641

All 584 prefixes in 641