List of counties in Ohio

There are 88 counties in the U.S. state of Ohio. Nine of them existed at the time of the Ohio Constitutional Convention in 1802. A tenth county, Wayne, was established on August 15, 1796, and encompassed roughly the present state of Michigan. During the Convention, the county was opposed to statehood, and was not only left out of the Convention, but dissolved; the current Wayne County is in northeastern Ohio, considerably distant from the area that was the original Wayne County.

The Ohio Constitution allows counties to set up a charter government as many cities and villages do, but only Summit and Cuyahoga counties have done so, the latter having been approved by voters in November 2009. Counties do not possess home rule powers and can do only what has been expressly authorized by the Ohio General Assembly. The elected county officials in Ohio county governments include three commissioners, a sheriff (the highest law enforcement officer in the county); prosecutor (equivalent of a district attorney in other states); coroner, engineer, Recorder, auditor, treasurer, and clerk of courts.

Population figures are based on the 2022 vintage Census population estimates. The population of Ohio was 11,756,058 at that time, a decrease of 0.4% from 2020. The average population of Ohio's counties was 133,592; Franklin County was the most populous (1,321,820) and Vinton County was the least (12,565). The average land area is 464 sq mi (1,200 km²). The largest county by area is Ashtabula County at 702.44 sq mi (1,819.3 km²), and its neighbor, Lake County, is the smallest at 228.21 sq mi (591.1 km²). The total area of the state is 40,860.69 sq mi (105,828.7 km²).

List of counties

List of county codes

The Federal Information Processing Standard (FIPS) is used by the U.S. government to uniquely identify counties. In the following table, these codes link to the United States Census Bureau's "quick facts" for each county. Ohio's FIPS code of 39 is used to distinguish from counties in other states. For example, Adams County's unique nationwide identifier is 39001.

Various state agencies identify counties by different coding schemes. The Ohio Department of Taxation assigns consecutive numbers for the purpose of enumerating taxing districts. The Ohio Department of Public Safety, including the Ohio Bureau of Motor Vehicles, associates these county numbers with vehicle registrations. The Department of Transportation uses three-letter abbreviations in road inventory and traffic management applications. For historic preservation purposes, Ohio History Connection refers to counties by two- and three-letter abbreviations in the Ohio Archaeological Inventory and Ohio Historic Inventory, respectively.

See also

• Ohio county government
• List of Ohio townships
• Illinois County, Virginia, the county that formerly covered all of present-day Ohio

References

Further reading

• Downes, Randolph Chandler. "Evolution of Ohio County Boundaries". Ohio Archaeological and Historical Publications. 36: 340–477. Archived from the original on 2014-11-05.
• Taylor, William Alexander; Taylor, Aubrey Clarence (1899). Ohio statesmen and annals of progress: from the year 1788 to the year 1900 ... State of Ohio.

1. List of municipalities in Ohio
2. List of United States counties and county equivalents
3. List of counties in Indiana
4. Adams County, Ohio
5. List of counties in Florida
6. List of highest-income counties in the United States
7. Allen County, Ohio
8. List of counties in Montana
9. List of townships in Ohio
10. List of counties in Connecticut
11. List of counties in New York
12. List of counties in Pennsylvania
13. List of counties in Oregon
14. List of counties in California
15. Ohio River
16. List of counties in Mississippi
17. List of counties in Alabama
18. List of cities and counties in Virginia
19. List of counties in Nebraska
20. List of counties in Missouri