Mercer County

Mercer County is a rural area in western Ohio covering roughly 473 square miles of farmland. The Wabash and St. Marys rivers run through this region, creating natural water boundaries.

The county was established in 1820 and organized four years later, named after Hugh Mercer, a Revolutionary War officer. Settlement followed the westward expansion pattern of the early 19th century.

German farming families arrived in the 1800s and built communities centered on agriculture, shaping how people here live and work. This heritage still shows in the way the land is used and how rural traditions remain part of daily life.

The area is mostly flat and open, making it easy to drive around and explore different parts of the county. Spring through fall are the best times to visit when the weather is mild.

The creation of Grand Lake divided Beaver Creek into two separate sections, creating distinct water features across the land. This engineered waterway change shapes how the area appears to visitors.

Location: Ohio

Inception: January 2, 1824

Capital city: Celina

Shares border with: Adams County, Van Wert County, Auglaize County, Shelby County, Darke County, Jay County

Website: http://mercercountyohio.org

GPS coordinates: 40.54000,-84.63000

Latest update: December 20, 2025 15:16