Formed December 8, 1875 (7th county)
Johnson County (8,451), Buffalo (4,415)
The red brick Italianate courthouse was built on a hill in 1884 at Main Street and Fort Street. United States Highway 16 turns in front of the courthouse. The courthouse was designed by Edward and James Curran. The building has been enlarged and a Justice Center was built in 2011. The county was organized on December 8, 1875 from parts of Carbon and Sweetwater counties as the 7th county and Buffalo has always been the county seat. Johnson County is named for a Cheyenne lawyer, E. P. Johnson. The county seat was named for Buffalo, New York.
Johnson County government consists of a sheriff and 3 Commissioners. Two District Court Judges and Two Circuit Court Judges serve Johnson and Sheridan counties. The county is in northeast Wyoming. Casper, Wyoming is south and Billings, Montana is northwest of the county. The county center is 29 miles South-Southeast of Buffalo nearer Mayoworth. The county is surrounded clockwise by Sheridan, Campbell, Converse, Natrona, Washakie, and Big Horn counties.
The area of the county is 4166 square miles. It is 10 out of 23 in the state. It ranks 18 out of 23 in population in the state. It has a density of 2.0 persons per square mile making it 20 out of 23 in the state. Johnson County has 55.2% of its population in its incorporated areas. Interstate Highway 25 originates in the county and goes south into Natrona County. Interstate Highway 90 comes from the east, Campbell County, and goes to the north, Sheridan County. United States Highway 16 enters from the north, Sheridan County, and exits to the west, Washakie County. United States Highway 87 is joined with Interstate Highway 90 from Sheridan County and continues joined with Interstate Highway 25 into Natrona County. The county is an overall rectangle with a spout on the northwest corner. Buffalo is located in the northwest quarter of the county. Buffalo is the county seat and the largest city. It is 52.2% of the county population.
Buffalo
Kaycee
