Idaho ZIP Codes

ZIP codes: 320
Cities & towns: 266
Counties: 44
Area codes: 2

How Idaho ZIP codes are numbered

832xx–838xx

The first three digits identify the sectional center facility that processes mail for a region, so an Idaho ZIP code can be placed geographically from its prefix alone. Each row names the city holding the most codes in that prefix.

Idaho three-digit ZIP prefixes, the codes in each, and the city that holds the most of them.
Prefix	ZIP codes	Main area
832xx	57	Pocatello
833xx	39	Sun Valley
834xx	45	Idaho Falls
835xx	28	Ahsahka
836xx	58	Nampa
837xx	29	Boise
838xx	64	Coeur d'Alene

Where Idaho's communities sit

Each point is an Idaho community with a published ZIP code list, plotted from its record coordinates. The outline is the convex envelope of those points — a footprint, not a boundary.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Idaho cities by ZIP code count

largest 25

Area codes serving Idaho

Scope every ZIP code recorded in Idaho. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. The map outline is a convex envelope of published places, not a state boundary.