Mercer County

Mercer County is an administrative division in northwestern Missouri that encompasses five municipalities and surrounding agricultural land. The county seat of Princeton serves as the center of local government operations.

The county was established in 1845 and named after General John F. Mercer, with permanent settlement beginning a few years earlier. The northern border later became the site of a significant territorial dispute between states.

The county's population of 3,558 residents maintains strong community ties through local events, agricultural activities, and gatherings at the county seat of Princeton.

County government offices including the Sheriff's department, Assessor's office, and Clerk's office are located in Princeton at a central address. Visitors looking for administrative services can find these facilities in the county seat.

The northern boundary of the county was the site of a territorial conflict between Missouri and Iowa during the 1800s. This border dispute remains part of the region's local history and memory.

Location: Missouri

Inception: 1845

Capital city: Princeton

Shares border with: Wayne County, Grundy County, Putnam County, Sullivan County, Harrison County, Decatur County

GPS coordinates: 40.42000,-93.57000

Latest update: December 10, 2025 15:52