Area code

IA

United States geographic area code, in service since 2000-07-09.

Split from 515.

Statusin service

Introduced2000-07-09

JurisdictionIA, US

Local dialing7D

Time zoneCentral

Last verified2026-09-17

Utilization 76.4% of assignable prefixes assigned As of 09/17/2026

0%605 of ~792 assignable NXX values (200–999 excl. N11)100%

Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-02-09, most recent 2026-06-11.

Area codes serve rate-center geographies, not municipal boundaries. “IA” identifies the jurisdiction, not an exact city footprint.

Top assignees

Ranked by assigned prefixes · initial assignee ≠ current carrier

Largest initial assignees in area code 641
Rank	Assignee	Prefixes	Share
01	WINDSTREAM IOWA COMMUNICATIONS, INC.	60	9.9%
02	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	46	7.6%
03	UNITED STATES CELLULAR - IA	39	6.4%
04	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	32	5.3%
05	QWEST CORPORATION	30	5%
06	ONVOY SPECTRUM, LLC	29	4.8%
07	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	28	4.6%
08	NEW CINGULAR WIRELESS PCS, LLC - IL	28	4.6%
09	FARMERS TEL. CO.	28	4.6%
10	T-MOBILE USA, INC.	23	3.8%

Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.

Change history

Recorded events for this NPA

2000-07-09Area code 641 entered service (created from 515).

Planning letters & orders

Primary documents

NANPA planning letters for area code 641
Date	Document	Subject
2000-04-24	PL-228 ↗	515 NPA Split, Creating New 641 NPA (Iowa)

Download area-code dataset ↓