Atchison County is located in the northwest corner of Missouri and is part of the St. Joseph, MO–KS Metropolitan Statistical Area. The county seat is Rock Port. The County was organized on February 14, 1845.

The county is governed by a three-member county commission, elected in November of each year. Other elected officials include the sheriff, prosecuting attorney, assessor, collector, and public administrator.

Atchison County is part of the St. Joseph, MO–KS Metropolitan Statistical Area. The county is home to several state parks, including Big Lake State Park, Squaw Creek Park, and Thousand Hills State Park. The county also has several historic sites, including the Atchison County Courthouse, the Atchison County Jail, and the Atchison County Museum.

For the most up-to-date and in-depth information, please check the public records links below.