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Johnson County, Wyoming facts for kids

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Johnson County
Johnson County Courthouse
Flag of Johnson County
Map of Wyoming highlighting Johnson County
Location within the U.S. state of Wyoming
Map of the United States highlighting Wyoming
Wyoming's location within the U.S.
Country  United States
State  Wyoming
Founded December 8, 1875 (authorized)
1881 (organized)
Seat Buffalo
Largest city Buffalo
 • Total 4,175 sq mi (10,810 km2)
 • Land 4,154 sq mi (10,760 km2)
 • Water 20 sq mi (50 km2)  0.5%%
 • Total 8,447
 • Estimate 
 • Density 2.0232/sq mi (0.78117/km2)
Time zone UTC−7 (Mountain)
 • Summer (DST) UTC−6 (MDT)
Congressional district At-large

Johnson County is a county in the north central part of the U.S. state of Wyoming. At the 2020 United States Census, the population was 8,447. The county seat is Buffalo. Kaycee is the only other incorporated town in the county.

Johnson County lies to the southeast of the Bighorn Mountains along Interstate 25 and Interstate 90. The Powder River flows northward through eastern Johnson County.


Johnson County was created on December 8, 1875 as Pease County from parts of Albany, Carbon, and Sweetwater Counties. It was organized in 1881. The county was originally named for Dr. E. L. Pease of Uinta County. In 1879, the county was renamed Johnson, for E. P. Johnson, a Cheyenne attorney.

In 1888, Sheridan County was created from a portion of Johnson County. In 1890, Big Horn County was created from Johnson County along with land from Fremont County and Sheridan County. In 1911, the boundaries of Johnson County and adjacent Crook, Natrona and Weston Counties were adjusted to run along federal land survey lines.

In April 1892, Johnson County was the scene of the Johnson County War, a range war between large cattle outfits and small stockgrowers.


According to the U.S. Census Bureau, the county has a total area of 4,175 square miles (10,810 km2), of which 4,154 square miles (10,760 km2) is land and 20 square miles (52 km2) (0.5%) is water.

Adjacent counties

Major highways

  • I-90.svg Interstate 90
  • I-25.svg Interstate 25
  • US 16.svg U.S. Highway 16
  • US 87.svg U.S. Highway 87
  • WY-193.svg Wyoming Highway 193
  • WY-196.svg Wyoming Highway 196
  • WY-192.svg Wyoming Highway 192
  • WY-387.svg Wyoming Highway 387

National protected area


Historical population
Census Pop.
1880 637
1890 2,357 270.0%
1900 2,361 0.2%
1910 3,453 46.3%
1920 4,617 33.7%
1930 4,816 4.3%
1940 4,980 3.4%
1950 4,707 −5.5%
1960 5,475 16.3%
1970 5,587 2.0%
1980 6,700 19.9%
1990 6,145 −8.3%
2000 7,075 15.1%
2010 8,569 21.1%
2020 8,447 −1.4%
US Decennial Census
1870–2000 2010–2016

2010 census

At the 2010 United States Census, there were 8,569 people, 3,782 households, and 2,410 families in the county. The population density was 2.1 per square mile (0.81/km2). There were 4,553 housing units at an average density of 1.1 per square mile (0.42/km2). The racial makeup was 96.5% white, 1.1% American Indian, 0.4% Asian, 0.2% black or African American, 0.7% from other races, and 1.1% from two or more races. Those of Hispanic or Latino origin made up 3.2% of the population. In terms of ancestry, 31.6% were German, 22.4% were Irish, 18.3% were English, and 6.1% were American.

Of the 3,782 households, 26.1% had children under the age of 18 living with them, 53.5% were married couples living together, 6.7% had a female householder with no husband present, 36.3% were non-families, and 31.8% of all households were made up of individuals. The average household size was 2.25 and the average family size was 2.83. The median age was 44.8 years.

The median household income was $45,638 and the median family income was $58,983. Males had a median income of $40,572 and females $30,352. The per capita income was $26,753. About 5.9% of families and 8.2% of the population were below the poverty line, including 8.0% of those under age 18 and 7.3% of those age 65 or over.




Unincorporated communities

See also

Kids robot.svg In Spanish: Condado de Johnson (Wyoming) para niños

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