Wyoming ZIP Codes

ZIP codes: 195
Cities & towns: 176
Counties: 23
Area codes: 1

How Wyoming ZIP codes are numbered

820xx–834xx

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

Wyoming three-digit ZIP prefixes, the codes in each, and the city that holds the most of them.
Prefix	ZIP codes	Main area
820xx	28	Cheyenne
821xx	1	Yellowstone National Park
822xx	20	Chugwater
823xx	14	Baggs
824xx	22	Basin
825xx	10	Arapahoe
826xx	21	Casper
827xx	18	Gillette
828xx	14	Arvada
829xx	21	Evanston
830xx	7	Jackson
831xx	18	Afton
834xx	1	Alta

Where Wyoming's communities sit

Each point is a Wyoming 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

Wyoming cities by ZIP code count

largest 25

Area codes serving Wyoming

307 Cheyenne

Scope every ZIP code recorded in Wyoming. 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.