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
| Type | Count | What it covers |
|---|---|---|
| Standard | 141 | Street delivery areas |
| PO Box | 50 | Post office boxes only |
| Unique | 3 | A single high-volume organization |
ZIP codes for major Wyoming cities
| City | County | Standard ZIPs | Range |
|---|---|---|---|
| Casper | Natrona County | 3 | 82601–82609 |
| Cheyenne | Laramie County | 3 | 82001–82009 |
| Gillette | Campbell County | 2 | 82716–82718 |
| Laramie | Albany County | 2 | 82070–82072 |
| Afton | Lincoln County | 1 | 83110–83110 |
| Aladdin | Crook County | 1 | 82710–82710 |
| Albin | Laramie County | 1 | 82050–82050 |
| Alcova | Natrona County | 1 | 82620–82620 |
| Alpine | Lincoln County | 1 | 83128–83128 |
| Alta | Teton County | 1 | 83414–83414 |
| Alva | Crook County | 1 | 82711–82711 |
| Arapahoe | Fremont County | 1 | 82510–82510 |
| Arminto | Natrona County | 1 | 82630–82630 |
| Arvada | Sheridan County | 1 | 82831–82831 |
| Auburn | Lincoln County | 1 | 83111–83111 |
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