Ottawa County Map, Ohio

Written and Fact-checked by | Updated On: April 30, 2026 | 13:31 ET

Map of Ottawa County - Ottawa County is a county located in the U.S. state of Ohio. Ottawa County Map showing cities, highways, important places and water bodies. Get Where is Ottawa County located in the map, major cities in Ottawa county, population, areas, and places of interest.

Map of Ottawa County, Ohio

Map of Ottawa County, Ohio

About Ottawa County Map, Ohio: The map showing the county boundary, county seat, major cities, highways, water bodies and neighbouring counties.

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About Ottawa County, Ohio

Ottawa County is a county located in the U.S. state of Ohio. It's county seat is Port Clinton. As per 2020 census, the population of Ottawa County is 40104 people and population density is square miles. According to the United States Census Bureau, the county has a total area of 254.95 sq mi (660 km2). Ottawa County was established on -21848.

Ottawa County Facts

ContinentNorth America
CountryUnited States
StateOhio
County SeatPort Clinton
Largest City/TownPort Clinton
EstablishedMarch 6, 1840
Total Area584 sq mi (1,512 sq km)
Land Area255 sq mi (661 sq km)
Water Area329 sq mi (852 sq km)
Population40,364 (Census 2020)
Population Density158 people per sq mi
Time ZoneEastern Time Zone (ET)
Major HighwaysState Route 2, State Route 53, State Route 163, State Route 19, State Route 269
Neighboring CountiesLucas County, Sandusky County, Erie County
Famous ForLake Erie islands, fishing, tourism, Marblehead Lighthouse
Top AttractionsPut-in-Bay, Kelleys Island, Marblehead Lighthouse, Cedar Point nearby
Official Websitehttps://www.co.ottawa.oh.us/

Cities and Towns in Ottawa County, Ohio

  • Port Clinton (county seat) – 6,056 (Census 2020)
  • Oak Harbor – 2,728 (Census 2020)
  • Genoa – 2,289 (Census 2020)
  • Marblehead – 903 (Census 2020)

Roads and Highways in Ottawa County, Ohio

Ottawa County is connected by highways that run along Lake Erie and provide access to coastal communities and islands.

  • State Route 2 – major east-west route along Lake Erie connecting Toledo to Sandusky
  • State Route 53 – connects Port Clinton to Fremont and inland areas
  • State Route 163 – links Oak Harbor to Port Clinton and the lakefront
  • State Route 19 – runs north-south connecting the county to Fremont
  • State Route 269 – provides access to Marblehead Peninsula and ferry terminals

Neighboring Counties of Ottawa County

  • Lucas County (west)
  • Sandusky County (south)
  • Erie County (east)

Top Attractions in Ottawa County, Ohio

Ottawa County is a popular destination for lakeside recreation, island tourism, and outdoor activities.

  • Put-in-Bay – lively island destination known for entertainment and waterfront views
  • Kelleys Island – peaceful island with natural attractions and glacial grooves
  • Marblehead Lighthouse – one of the oldest lighthouses on the Great Lakes
  • East Harbor State Park – offers camping, beaches, and boating
  • Port Clinton Waterfront – scenic area with restaurants and marinas
  • African Safari Wildlife Park – drive-through safari park near Port Clinton
  • Ottawa National Wildlife Refuge – great for birdwatching and nature trails
  • Catawba Island area – popular for boating, wineries, and scenic views

Distance from Ottawa County to Nearby Cities

  • Ottawa County to Toledo – 35 mi (56 km)
  • Ottawa County to Sandusky – 20 mi (32 km)
  • Ottawa County to Cleveland – 70 mi (113 km)
  • Ottawa County to Detroit – 80 mi (129 km)
  • Ottawa County to Columbus – 120 mi (193 km)

FAQs about Ottawa County

Where is Ottawa County located?

Ottawa County is located in northern Ohio along the southern shore of Lake Erie.

What is Ottawa County known for?

It is known for Lake Erie islands, fishing, tourism, and historic lighthouses.

What is the population of Ottawa County?

The population was 40,364 according to the 2020 Census.

What is the county seat of Ottawa County?

The county seat is Port Clinton.

Are there attractions in Ottawa County?

Yes, the county offers islands, parks, beaches, and outdoor recreation.