Every ZIP code in the United States, with weather, radar, trivia and the numbers behind it. Five digits since 1963!

ZIP stands for Zone Improvement Plan. The codes went live on July 1, 1963.The lowest ZIP code is 00501 — the IRS in Holtsville, New York.The highest ZIP code is 99950, in Ketchikan, Alaska.Type 07734 into a calculator and turn it upside down: hELLO. It is Keansburg, New Jersey.12345 belongs to one company: General Electric in Schenectady, New York.The first digit is a region: 0 is New England and New Jersey, 9 is the West Coast, Alaska and Hawaii.Mr. ZIP, the cartoon mailman, was the mascot that sold the idea to America.ZIP+4 arrived in 1983 and can narrow a ZIP down to one side of one block.A ZIP code is a mail route, not a place: plenty of them cross county and even state lines.Play ZIP Hunt: guess the secret ZIP code of the day in six tries.
zipcodes.pro — STATE/WY/COUNTY/JOHNSON

Johnson County, WY ZIP codes

Johnson County, WY has 4 ZIP codes, in 4 towns: 82834, 82639, 82640 and 82840.

The county seat is Buffalo.

ZIP codes
4
Towns
4
County seat
Buffalo
County FIPS
56019
State
Wyoming
Population
8,686
Median household income
$64,871
Land area
4,154 sq mi

Johnson County ZIP codes by town

Buffalo (county seat)
82834

Each ZIP code is listed under the county most of its land lies in and the town the Postal Service names it for; a ZIP code's own page shows exactly how it is split.

Map of Johnson County ZIP codes

82639826408283482840

The ZIP codes of Johnson County, shaded. Outlines are Census ZIP Code Tabulation Areas (2020), which approximate the mail routes; PO-box and single-address codes have no area and are not drawn. Click any area to open its ZIP code.

Johnson County in numbers

About 8,686 people live in Johnson County, in 3,932 households, the 17th most populous of Wyoming's 23 counties. The median household income is $64,871 a year, 15% below the Wyoming median of $76,176 (US: $80,734). The median owner-occupied home is valued at $326,800 (6% above the Wyoming median), and median gross rent is $1,029 a month. The median age is 47.3; 30.3% of adults 25 and over hold a bachelor's degree or higher (30.6% across Wyoming); the average commute takes 17 minutes.

Population8,686Johnson8,686
Households3,932Johnson3,932
Median age47.3Johnson47.3Wyoming39.1US 38.9
Median household income$64,871Johnson$64,871Wyoming$76,176US $80,734
Median home value$326,800Johnson$326,800Wyoming$309,700US $332,700
Median gross rent$1,029Johnson$1,029Wyoming$992US $1,413
Bachelor's degree or higher30.3%Johnson30.3%Wyoming30.6%US 35.7%
Mean commute16.7 minJohnson16.7 minWyoming18.8 minUS 26.4 min
Population density2 / sq miJohnson2 / sq mi

U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates. Survey estimates carry margins of error, wider for small places. Sources and methods.

Largest towns in Johnson County

Largest towns in Johnson County
TownZIP codesPopulation
Buffalo 1 4,572
Kaycee 1 280
Linch 1 175

Population of the census place of that name where there is one, otherwise of the ZIP codes the Postal Service addresses by it. A town's ZIP codes can reach past the county line.

Neighbouring counties

Counties that share a ZIP code with Johnson County.

Not sure you are in Johnson County? What county am I in? answers from your location, near a county line included.

Every ZIP code in Johnson County, with figures

ZIP codes in Johnson County
ZIP City Type Population Median income Median home
82639 Kaycee , WY Standard 782 $72,112 $194,300
82640 Linch , WY Standard 175 $250,000+ $610,500
82834 Buffalo , WY Standard 7,588 $63,395 $328,700
82840 Saddlestring , WY No street area — — —

Cite this page

zipcodes.pro. “Johnson County ZIP codes.” Data release 2026-10-12. Retrieved 2026-10-20. https://zipcodes.pro/state/wy/county/johnson

Underlying data is public domain or openly licensed — sources, vintages and licences.