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The average population of Ohio's counties was 133,931; Franklin County was the most populous (1,326,063) and Vinton County was the least (12,474). The average land area is 464 sq mi (1,200 km 2 ). The largest county by area is Ashtabula County at 702.44 sq mi (1,819.3 km 2 ), and its neighbor, Lake County , is the smallest at 228.21 sq mi (591.1 km 2 ).
Hamilton County: French for "clear mountain" 208,601: 451.99 sq mi (1,171 km 2) Clinton County: 027: Wilmington: Mar 1, 1810: Highland and Warren Counties: George Clinton (1739–1812), vice-president when the county was organized 42,018: 410.88 sq mi (1,064 km 2) Columbiana County: 029: Lisbon: May 1, 1803: Jefferson and Washington Counties
CountyFips Code [1]County Seat [2]Created [2] [3]Jul 10, 1797Feb 24, 1846Jun 7, 1807Mar 1, 1805Aug 25, 2023 · Below is a map of Ohio's 88 counties. The Ohio Secretary of State provides an alphabetical list of counties with additional information, such as county seats, population, and websites.
2 days ago · See a county map of Ohio on Google Maps with this free, interactive map tool. This Ohio county map shows county borders and also has options to show county name labels, overlay city limits and townships and more. To do a county lookup by address, type the address into the “Search places” box above the map.
The U.S. state of Ohio is divided into 88 counties. Explore the Ohio County Map, list of Counties in Ohio along with their County Seats in alphabetical order and check their population, areas and the date of formation.
S.nCountyCounty SeatPopulation (2011)1Adams CountyWest Union28,5502Allen CountyLima106,3313Ashland CountyAshland53,1394Ashtabula CountyJefferson101,497Interactive Map of Ohio Counties. Click on any of the counties on the map to see its population, economic data, time zone, and zip code (the data will appear below the map ). Data is sourced from the US Census 2021.
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Discover information on all 88 counties in the State of Ohio. Learn about historical facts and county boundary changes. Also a complete list of current and old (extinct) Ohio counties.