The county has over 53 percent of Yellowstone National Park's land area.

[3] Many attractions abound, including the Buffalo Bill Historical Center, the Cody Stampede Rodeo, the Ghost Town of Kirwin, and the western museum Old Trail Town.

Wyoming Territory was established on July 25, 1868, at which time Laramie County was assigned to this jurisdiction.

The county governing structure was put in place during 1911;[4] a courthouse was constructed 1911–1912.

[6] Immigrants from Ireland and Germany settled in what would become Park County in the 1870s.

Many English immigrants who had settled in Wyoming and become American citizens remained connected to England, many of the children of these English immigrants who had been born and raised in Wyoming joined the Canadian military in order to fight alongside Britain during World War I, and subsequently, when America joined the war many volunteered to join the United States military before the U.S. officially instituted a draft.

Much of Park County is held under state or federal control.

[10] As of the 2000 United States Census,[14] there were 25,786 people, 10,312 households, and 7,094 families in the county.

26.20% of all households were made up of individuals, and 10.00% had someone living alone who was 65 years of age or older.

As of the 2010 United States Census, there were 28,205 people, 11,885 households, and 7,777 families in the county.

[15] In terms of ancestry, 31.7% were German, 16.3% were English, 15.4% were Irish, and 6.3% were American.