Area code

IA

United States geographic area code, in service since 2001-03-25.

Split from 319.

Statusin service

Introduced2001-03-25

JurisdictionIA, US

Local dialing7D

Time zoneCentral

Last verified2026-09-17

Utilization 51.9% of assignable prefixes assigned As of 09/17/2026

0%411 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 2001-01-04, most recent 2026-06-03.

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 563
Rank	Assignee	Prefixes	Share
01	QWEST CORPORATION	54	13.1%
02	UNITED STATES CELLULAR - IA	33	8%
03	WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH	26	6.3%
04	T-MOBILE USA, INC.	25	6.1%
05	WINDSTREAM IOWA COMMUNICATIONS, INC. - SYSTEMS	22	5.4%
06	NEW CINGULAR WIRELESS PCS, LLC - IL	18	4.4%
07	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA	18	4.4%
08	ONVOY, LLC - IA	15	3.6%
09	TON80 COMMUNICATIONS, LLC	12	2.9%
10	MULTIPLE OCN LISTING	12	2.9%

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

2001-03-25Area code 563 entered service (created from 319).

Planning letters & orders

Primary documents

NANPA planning letters for area code 563
Date	Document	Subject
2001-01-02	PL-253 ↗	319 NPA Split, Creating 563 NPA (Iowa)

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