Ottawa County, Ohio

Ottawa County
Ottawa County Courthouse
Location within the U.S. state of Ohio
Ohio's location within the U.S.
Coordinates: 41°35′N 83°04′W / 41.59°N 83.06°W / 41.59; -83.06
Country United States
State Ohio
FoundedMarch 6, 1840
Named afterthe Ottawa tribe or a word meaning "trader"
SeatPort Clinton
Largest cityPort Clinton
Area
  Total
585 sq mi (1,520 km2)
  Land255 sq mi (660 km2)
  Water330 sq mi (900 km2)  56%
Population
 (2020)
  Total
40,364
  Density158/sq mi (61/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district9th
Websitewww.co.ottawa.oh.us

Ottawa County is a county located in the northwestern part of the U.S. state of Ohio. As of the 2020 census, the population was 40,364. Its county seat is Port Clinton. The county is named either for the Ottawa (Odawa) Indigenous peoples who lived there, or for an Indigenous word meaning "trader".

Ottawa County comprises the Port Clinton, OH Micropolitan Statistical Area, which is also included in the Toledo-Port Clinton, OH Combined Statistical Area.