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... Wikipedia
County seat: Carthage
Population: 124,075 (2022)
Area: 641 mi²
Congressional district: 7th
Founded: January 2, 1841
Largest city: Joplin