Sullivan County

Sullivan County is an administrative division in northern Missouri that contains several small communities and rural townships. The landscape is shaped by two main waterways, Medicine Creek and Locust Creek, which flow through the region.

The county was established on February 14, 1845, and named after Major General John Sullivan, a significant military leader during the American Revolutionary War. This reflected a broader effort to settle and organize Missouri's northern frontier during the 1800s.

Several school districts, including Green City R-I and Milan C-2, provide education services to the residents of Sullivan County across multiple communities.

Milan serves as the county seat and is home to the courthouse and main government offices for the area. Visitors exploring the county will find this town a useful reference point for basic services and local information.

The construction of the second courthouse in Milan in 1858 required removing an Indian mound that once stood at the center of town. This action erased an important trace of earlier settlement and reveals much about how the frontier was transformed during this period.

Location: Missouri

Inception: 1845

Capital city: Milan

Shares border with: Putnam County, Linn County, Adair County, Grundy County, Mercer County

GPS coordinates: 40.21000,-93.11000

Latest update: December 10, 2025 15:55