Seneca County, Ohio

41°08′N 83°08′W / 41.13°N 83.13°W / 41.13; -83.13

Seneca County
Seneca County Justice Center in Tiffin, Ohio
Flag of Seneca County
Official seal of Seneca County
Map of Ohio highlighting Seneca County
Location within the U.S. state of Ohio
Map of the United States highlighting Ohio
Ohio's location within the U.S.
Coordinates: 41°08′N 83°08′W / 41.13°N 83.13°W / 41.13; -83.13
Country United States
State Ohio
FoundedApril 1, 1824
Named forthe Seneca nation
SeatTiffin
Largest cityTiffin
Area
 • Total
553 sq mi (1,430 km2)
 • Land551 sq mi (1,430 km2)
 • Water1.8 sq mi (5 km2)  0.3%
Population
 (2020)
 • Total
55,069 Decrease
 • Density100/sq mi (40/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional district5th
Websitesenecacountyohio.gov

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.[1] Its county seat is Tiffin.[2] The county was created in 1820 and organized in 1824.[3] 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.[4] Seneca County comprises the Tiffin, OH Micropolitan Statistical Area, which is also included in the Findlay–Tiffin, OH Combined Statistical Area.

  1. ^ 2020 census
  2. ^ "Find a County". National Association of Counties. Retrieved June 7, 2011.
  3. ^ "Ohio: Individual County Chronologies". Ohio Atlas of Historical County Boundaries. The Newberry Library. 2007. Archived from the original on April 6, 2016. Retrieved February 14, 2015.
  4. ^ Cite error: The named reference osuedc was invoked but never defined (see the help page).