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Welcome to Ottawa County ...

Time Zone: Ottawa County lies in the Eastern Time Zone (EST/EDT) and observes daylight saving time.

The community of Port Clinton is the Seat for Ottawa County.

Ottawa County was founded March 6, 1840. Ottawa was created by taking area from Erie, Sandusky and Lucas Counties.

From the Census Estimates for 2019, <1> Ottawa had a population of 40,525 people. This is a decrease of 2.02% since the last Census (which gave a population of 41,359 people in 2010).

At the time of the 2010 Census, Ottawa represented 0.36% of the total population of Ohio.

Below are some of the communities located in Ottawa County:

  • Clay Center
    (16 miles [25.7 km] to the west)
    • Clay Center is located in Ottawa County (OH)
    • Jump to our Gazetteer entry for Clay Center
    • Population from the 2020 Census: 299 people
  • Elmore
    (14 miles [22.5 km] to the west)
    • Elmore is located in Ottawa County (OH)
    • Jump to our Gazetteer entry for Elmore
    • Population from the 2020 Census: 1,401 people
    • Jump to TripAdvisor's Tourism page for Elmore <2>
  • Genoa
    (16 miles [25.7 km] to the west)
    • Genoa is located in Ottawa County (OH)
    • Jump to our Gazetteer entry for Genoa
    • Population from the 2020 Census: 2,262 people
    • Jump to TripAdvisor's Tourism page for Genoa <2>
  • Marblehead
    (16 miles [25.7 km] to the east)
  • Oak Harbor
    (5 miles [8 km] to the southwest)
  • Port Clinton
    (5 miles [8 km] to the southeast)
  • Put-in-Bay
    (13 miles [20.9 km] to the northeast)
  • Rocky Ridge
    (8 miles [12.9 km] to the west)
    • Rocky Ridge is located in Ottawa County (OH)
    • Jump to our Gazetteer entry for Rocky Ridge
    • Population from the 2020 Census: 407 people

Websites of Interest ...

Footnotes ...

<1>On a yearly basis, the US Census Bureau creates an estimate of the county's population. Keep in mind that this is an estimate and not an actual count. The last physical count was the 2010 Census and the next count will be for the 2020 Census.
<2>While we're fans and frequent users of TripAdvisor, you should know that we're also members of the TripAdvisor affiliate program.