712
Area code
IA
United States geographic area code, in service since 1947-01-01.
Statusin service
Introduced1947-01-01
JurisdictionIA, US
Local dialing7D
Time zoneCentral
Last verified2026-09-17
Utilization 82.8% of assignable prefixes assigned
As of 09/17/2026
0%656 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 2001-01-18, most recent 2026-08-05.
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| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA | 68 | 10.4% |
| 02 | QWEST CORPORATION | 64 | 9.8% |
| 03 | WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH | 48 | 7.3% |
| 04 | NEW CINGULAR WIRELESS PCS, LLC - IL | 43 | 6.6% |
| 05 | ONVOY, LLC - IA | 30 | 4.6% |
| 06 | FRONTIER COMMUNICATIONS OF IOWA, INC. | 24 | 3.7% |
| 07 | WINDSTREAM IOWA COMMUNICATIONS, INC. | 20 | 3% |
| 08 | UNITED STATES CELLULAR - IA | 20 | 3% |
| 09 | T-MOBILE USA, INC. | 17 | 2.6% |
| 10 | NORTHWEST IOWA TELEPHONE, LLC | 14 | 2.1% |
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- 1947-01-01Area code 712 entered service.