Ohio County, Indiana

Ohio County
Ohio County Courthouse in Rising Sun
Location within the U.S. state of Indiana
Indiana's location within the U.S.
Coordinates: 38°57′N 84°58′W / 38.95°N 84.97°W / 38.95; -84.97
Country United States
State Indiana
Founded1844
Named afterOhio River
SeatRising Sun
Largest cityRising Sun
Area
  Total
87.43 sq mi (226.4 km2)
  Land86.14 sq mi (223.1 km2)
  Water1.29 sq mi (3.3 km2)  1.48%
Population
 (2020)
  Total
5,940
  Estimate 
(2023)
6,004
  Density68/sq mi (26/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional district6th
Websiteohiocountyin.gov
Indiana county number 58
FIPS County Code 115
Smallest county in Indiana in area
Least populated county in Indiana

Ohio County is a county located in southeastern Indiana. With a 2020 population of 5,940, and an area of just 87 square miles, Ohio County is the smallest county in Indiana by area and the least populous. The county seat and only incorporated municipality is Rising Sun. The county was officially established in 1844 and was one of the last Indiana counties to be created. Ohio County borders the state of Kentucky across the Ohio River for which it was named. It is part of the Cincinnati, OH-KY-IN Metropolitan Statistical Area. The county is divided into four townships which provide local services. Three state roads pass through or into the county.