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Ottawa County, Ohio facts for kids

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Ottawa County
Ottawa County Courthouse
Flag of Ottawa County
Official seal of Ottawa County
Map of Ohio highlighting Ottawa County
Location within the U.S. state of Ohio
Map of the United States highlighting Ohio
Ohio's location within the U.S.
Country  United States
State  Ohio
Founded March 6, 1840
Named for the Ottawa tribe or a word meaning "trader"
Seat Port Clinton
Largest city Port Clinton
 • Total 585 sq mi (1,520 km2)
 • Land 255 sq mi (660 km2)
 • Water 330 sq mi (900 km2)  56%%
 • Total 40,364
 • Density 69.00/sq mi (26.640/km2)
Time zone UTC−5 (Eastern)
 • Summer (DST) UTC−4 (EDT)
Congressional districts 5th, 9th

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.


On September 10, 1813, during the War of 1812, nine vessels of the United States Navy under Commodore Oliver Hazard Perry, decisively defeated six vessels of Great Britain’s Royal Navy in the Battle of Lake Erie near Put-in-Bay. This action was one of the major battles of the war.

Ottawa County was formed on March 6, 1840 from portions of Erie, Lucas and Sandusky counties. It was named after the North American Indian tribe of the Ottawa.

In 1974, the County Courthouse was listed on the National Register of Historic Places.

The county is notable in presidential politics for being a bellwether, having continuously voted for the winning candidate for thirteen elections beginning in 1964.


According to the U.S. Census Bureau, the county has a total area of 585 square miles (1,520 km2), of which 255 square miles (660 km2) is land and 330 square miles (850 km2) (56%) is water. It is the third-smallest county in Ohio by land area. It borders Ontario across Lake Erie.

Adjacent counties

National protected areas


Historical population
Census Pop.
1840 2,248
1850 3,308 47.2%
1860 7,016 112.1%
1870 13,364 90.5%
1880 19,762 47.9%
1890 21,974 11.2%
1900 22,213 1.1%
1910 22,360 0.7%
1920 22,193 −0.7%
1930 24,109 8.6%
1940 24,360 1.0%
1950 29,469 21.0%
1960 35,323 19.9%
1970 37,099 5.0%
1980 40,076 8.0%
1990 40,029 −0.1%
2000 40,985 2.4%
2010 41,428 1.1%
2020 40,364 −2.6%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2020

2010 census

As of the 2010 United States Census, there were 41,428 people, 17,503 households, and 11,884 families living in the county. The population density was 162.5 inhabitants per square mile (62.7/km2). There were 27,909 housing units at an average density of 109.5 per square mile (42.3/km2). The racial makeup of the county was 96.5% white, 0.8% black or African American, 0.3% Asian, 0.2% American Indian, 0.9% from other races, and 1.3% from two or more races. Those of Hispanic or Latino origin made up 4.2% of the population. In terms of ancestry, 44.6% were German, 11.9% were Irish, 9.8% were English, 6.3% were American, and 6.1% were Polish.

Of the 17,503 households, 26.3% had children under the age of 18 living with them, 54.7% were married couples living together, 8.9% had a female householder with no husband present, 32.1% were non-families, and 27.4% of all households were made up of individuals. The average household size was 2.34 and the average family size was 2.82. The median age was 46.3 years.

The median income for a household in the county was $53,463 and the median income for a family was $64,258. Males had a median income of $52,736 versus $33,557 for females. The per capita income for the county was $27,809. About 6.3% of families and 9.0% of the population were below the poverty line, including 11.9% of those under age 18 and 6.5% of those age 65 or over.


Major highways

8 major highways run through Ottawa County, including two interstates, and eight state routes.

  • I-80.svg Interstate 80 (Ohio Turnpike)
  • I-90.svg Interstate 90 (Ohio Turnpike)
  • OH-2.svg Ohio State Route 2
  • OH-19.svg Ohio State Route 19
  • OH-51.svg Ohio State Route 51
  • OH-53.svg Ohio State Route 53
  • OH-105.svg Ohio State Route 105
  • OH-163.svg Ohio State Route 163
  • OH-269.svg Ohio State Route 269
  • OH-590.svg Ohio State Route 590


  • Erie-Ottawa Regional Airport
  • Middle Bass-East Point Airport
  • Middle Bass Island Airport
  • North Bass Island Airport
  • Put-in-Bay Airport


Map of Ottawa County Ohio With Municipal and Township Labels
Map of Ottawa County, Ohio with municipal and township labels




Census-designated places

Other unincorporated communities

Notable residents

See also

Kids robot.svg In Spanish: Condado de Ottawa (Ohio) para niños

Black History Month on Kiddle
Famous African-American Inventors:
George Robert Carruthers
Patricia Bath
Jan Ernst Matzeliger
Alexander Miles
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