County ZIP codes · Wyoming · FIPS 56019
Johnson County, WY ZIP Codes
Johnson County, Wyoming has 6 ZIP codes (Census 2020 ZCTA-county file; GeoNames postal codes, October 2026): 5 residential and 1 for PO boxes or a single organization. 3 of the residential ones lie mainly in Johnson County and 2 mainly in a neighboring county; 3 cross the county line.
- ACS2020-24
- Census2020
Where are the ZIP codes of Johnson County?
Source: U.S. Census Bureau, 2020 ZCTA cartographic boundaries; ACS 2020-2024 5-year estimates (B19013).
All 5 residential ZIP codes in Johnson County
3 ZIP codes lie mainly in Johnson County; 2 more reach into it from a neighboring county and follow the first table.
| In this county | ||||||
|---|---|---|---|---|---|---|
| 82834 | Buffalo | 7,588 | 5 | $63k | $329k | 100% |
| 82639 | Kaycee | 782 | 1 | $72k | $194k | 94% |
| 82640 | Linch | 175 | 7 | $250k+ | $611k | 100% |
Partly in Johnson County
Source: U.S. Census Bureau, ACS 2020-2024 5-year estimates; county shares by land area (Census 2020 ZCTA-county relationship file).
Which ZIP codes cross the county line?
3 ZIP codes of Johnson County extend into another county. A ZIP code follows mail routes, not county borders.
| ZIP | In Johnson | Elsewhere |
|---|---|---|
| 82832 | 21% | Sheridan County 79% |
| 82639 | 94% | Natrona County 6% |
| 82831 | 32% | Campbell County 34%; Sheridan County 34% |
Source: U.S. Census Bureau, 2020 ZCTA-county relationship file (shares of land area).
PO Box and single-organization ZIP codes
| ZIP | Postal name |
|---|---|
| 82840 | Saddlestring |
Source: GeoNames postal codes (CC BY 4.0).
Which first three digits do Johnson County's ZIP codes use?
The first three digits of a ZIP code name the sectional center, the mail processing plant that sorts it. Johnson County's ZIP codes use 2 prefixes: 826 and 828.
Source: U.S. Postal Service, labeling list L005 (3-digit ZIP Code prefix groups, SCF sortation), effective October 1, 2026.