Dearborn County

Also known as Dearborn County, Indiana, Dearborn County, IN

county in Indiana, United States

Key facts

Country: United States
State: Indiana
Named after: Dr. Henry Dearborn
Seat: Lawrenceburg
Largest city: Lawrenceburg
Total: 307.42 sq mi (796.2 km )
Land: 305.03 sq mi (790.0 km )
Water: 2.38 sq mi (6.2 km ) 0.77%
Estimate 2025: 51,609
Density: 166.14/sq mi (64.149/km )
Demonym: Dearbornian
Time zone: UTC−5 ( Eastern )
Summer dst

Article

Lawrenceburg on the Ohio River, from the air. AEP's Tanner's Creek Generating Station at lower-left.

Dearborn County is one of 92 counties of the U.S. state of Indiana. Located on the Ohio border near the southeast corner of the state, Dearborn County was formed in 1803 from a portion of Hamilton County, Ohio. In 2020, the population was 50,679. The county seat and largest city is Lawrenceburg. Dearborn County is part of the Cincinnati, OH-KY-IN Metropolitan Statistical Area.