Wyoming ZIP Codes: Ranges, Prefixes and Major Cities

Wyoming uses 194 active ZIP codes, running from 82001 to 83414. This guide shows how those codes are grouped, which ones serve the state's largest cities and how to format them correctly.

ZIP code range and prefixes

Every Wyoming ZIP code starts with one of 13 three-digit prefixes. Each prefix points to a sectional center facility, the processing plant that sorts mail for a group of nearby post offices.

  • 820
  • 821
  • 822
  • 823
  • 824
  • 825
  • 826
  • 827
  • 828
  • 829
  • 830
  • 831
  • 834

Types of ZIP codes in Wyoming

TypeCountWhat it covers
Standard141Street delivery areas
PO Box50Post office boxes only
Unique3A single high-volume organization

ZIP codes for major Wyoming cities

CityCountyStandard ZIPsRange
CasperNatrona County382601–82609
CheyenneLaramie County382001–82009
GilletteCampbell County282716–82718
LaramieAlbany County282070–82072
AftonLincoln County183110–83110
AladdinCrook County182710–82710
AlbinLaramie County182050–82050
AlcovaNatrona County182620–82620
AlpineLincoln County183128–83128
AltaTeton County183414–83414
AlvaCrook County182711–82711
ArapahoeFremont County182510–82510
ArmintoNatrona County182630–82630
ArvadaSheridan County182831–82831
AuburnLincoln County183111–83111

Cheyenne is the state capital. Larger cities have many ZIP codes because each code follows mail delivery routes, not city limits.

Sample addresses

Matthew Hill 265 Madison St Arapahoe, WY 82510
Michelle Jackson 238 Park St Aladdin, WY 82710
Nancy Young 9082 Hickory Pl Alta, WY 83414

These examples use real city and ZIP pairs with invented street lines, so they are safe for testing and documentation.

Tips for working with these ZIP codes

  • Store ZIP codes as text, not numbers, so the format stays consistent across states with leading zeros.
  • All of Wyoming is in the Mountain time zone, which keeps scheduling logic simple.
  • A quick sanity check: a valid WY ZIP code begins with one of the prefixes listed above.
  • City names in addresses are post office names. A suburb may share a ZIP code and city name with a nearby larger town.

Create realistic Wyoming addresses for testing, with real cities, counties and ZIP codes.

Generate Wyoming addresses