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Seneca County, Ohio
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Seneca County, Ohio Map
An detailed map of Seneca County. Click on a nearby County to view more information about that County.
Map of Townships in Seneca County, Ohio
An interactive map of county subdivisions in Seneca County. In Ohio, that can include Townships and Villages. Find what township you are in now.
Map of Counties in Ohio
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About Seneca County, Ohio
Seneca County is a county located in the northwestern part of the U.S. state of Ohio. As of the 2020 census, the population was 55,069. Its county seat is Tiffin. The county was created in 1820 and organized in 1824. It is named for the Seneca Indians, the westernmost nation of the Iroquois Confederacy. This people were based in present-day New York but had territory extending into Pennsylvania and Ohio. Seneca County comprises the Tiffin, OH Micropolitan Statistical Area, which is also included in the Findlay–Tiffin, OH Combined Statistical Area.
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