St. Clair County

St. Clair County is an administrative division in western Missouri that spans across 702 square miles (1,820 square kilometers) of rural and developed land. The region contains several towns and encompasses farmland along with natural areas connected by state and federal highways.

The county was established in 1841 and named after General Arthur St. Clair, a military officer who served as Governor of the Northwest Territory. This honor reflected his significance during the early development of the United States.

The county maintains several educational districts, including Appleton City R-II, Hudson R-IX, and Osceola Public Schools, serving local communities.

The main roads crossing this county are U.S. Route 54 and State Routes 13, 52, and 82, which help visitors navigate the area. The landscape is generally flat and easy to drive through for those exploring the region.

The county seat of Osceola manages administrative functions while Appleton City stands as the largest population center in the jurisdiction.

Location: Missouri

Inception: 1841

Capital city: Osceola

Shares border with: Henry County, Cedar County, Polk County, Hickory County, Benton County, Bates County, Vernon County

Website: http://stclaircomo.com

GPS coordinates: 38.04000,-93.77000

Latest update: December 7, 2025 20:41