North American Numbers Source-cited · ownership disclosed
Area code
712
In service
United States · since 1947

Sioux City / western Iowa

Serves western Iowa including Sioux City and Council Bluffs. An original 1947 code and the only Iowa area code that still has its original boundaries.

The essentials Numbering data · NumberResearch · as of 2026-09-18
Place
Sioux City / western Iowa
Type
geographic
Status
in service
In service since
1947
Projected exhaust
2039 Q2

Status, dates and counts are read from NumberResearch (NANPA / CNAC / FCC records). Assignment records show initial assignees, not the carrier serving a number today.

A · Where it is

Where 712 is

Western Iowa along the Missouri River and adjacent counties..

Communities served wholly or partly by 712:

Sioux CityCouncil BluffsLe MarsSpencerStorm LakeCarrollShenandoahRed Oak
B · Relationships

How it relates to other codes

The codes 712 was split from, spawned, or shares its area with. A split divides the map and changes some numbers; an overlay shares the same ground and changes none — what's the difference?

Related · 1947 515 Des Moines / central Iowa Adjacent to the east.
Related · 1947 402 Omaha / Lincoln / eastern Nebraska Adjacent across the Missouri River (Nebraska).
What's changing. No overlay and never split; retains its original 1947 boundaries.
C · History

How 712 got here

1947
Established as one of Iowa's three original area codes, serving the western portion.
Source: Wikipedia
D · Capacity

How full it is

Prefixes assigned
656
Prefixes available
144
Thousands-blocks assigned
2,248

Prefix-assignment counts describe allocation to carriers, not how many individual numbers are in use. Full technical records: NumberResearch ↗.

Compare 712 with another code →
Sources
Wikipedia ↗
Area code 712
NumberResearch.org ↗
Live status, dates, assignment counts and exhaust forecast — data as of 2026-09-18 (CC BY 4.0).

Place, relationships and history above are compiled by North American Numbers from the sources listed and last checked 2026-09-18. A check date is not an expert review — see how this is made. Flag an error.