Mercer County, Ohio

Mercer County, Ohio
County
Mercer County Courthouse
Mercer County Courthouse
Flag of Mercer County, Ohio
Flag
Official seal of Mercer County, Ohio
Seal
Map of Ohio highlighting Mercer County
Location within the U.S. state of Ohio
Coordinates: 40°32′N 84°38′W / 40.54°N 84.63°W / 40.54; -84.63
Country United States
State Ohio
FoundedJanuary 2, 1824
Named forHugh Mercer
SeatCelina
Largest cityCelina
Area
 • Total
473 sq mi (1,230 km2)
 • Land462 sq mi (1,200 km2)
 • Water11 sq mi (28 km2)  2.3%
Population
 (2020)
 • Total
42,528
 • Estimate 
(2025)
42,737 Increase
 • Density90/sq mi (35/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district5th
Websitewww.mercercountyohio.gov
Grand Lake St. Marys State Park
Graftonoceras fossil nautiloid, found near Coldwater, southern Mercer County.

Mercer County is located in the U.S. state of Ohio. As of the 2020 census, the population was 42,528. Its county seat is Celina. The county was created in 1820 and later organized in 1824. It is named for Hugh Mercer, an officer in the American Revolutionary War.

Mercer County comprises the Celina, Ohio Micropolitan Statistical Area.

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