Jasper County, Missouri

Jasper County is located in the southwest portion of the U.S. state of Missouri. As of the 2020 census, the population was 122,761. Its county seat is Carthage, and its largest city is Joplin. The county was organized in 1841 and named for William Jasper, a hero of the American Revolutionary War. Jasper County is included in the Joplin Metropolitan Statistical Area. The Jasper County Sheriff’s Office has legal jurisdiction throughout the county.