[2] The county was organized in 1846 and is named after Sergeant William Jasper, a Revolutionary War hero.

[5] The North and South Skunk River flow through the county.

Bodies of water include Lake Mariposa and Rock Creek.

[13] As of the census[14] of 2000, there were 37,213 people, 14,689 households, and 10,267 families residing in the county.

26.10% of all households were made up of individuals, and 11.80% had someone living alone who was 65 years of age or older.

[15] (part) The population ranking of the following table is based on the 2020 census of Jasper County.