Madison County
Also known as Madison County, Ohio, Madison County, OH
county in Ohio, United States
Key facts
- Country
- United States
- State
- Ohio
- Founded
- February 16, 1810
- Named after
- James Madison
- Seat
- London
- Largest city
- London
- Total
- 467 sq mi (1,210 km )
- Land
- 466 sq mi (1,210 km )
- Water
- 0.8 sq mi (2.1 km ) 0.2%
- Estimate 2025
- 46,985
- Density
- 94.0/sq mi (36.3/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
- UTC−4 ( EDT )
Article
Madison County is a county located in the central portion of the U.S. state of Ohio. As of the 2020 census, the population was 43,824. Its county seat is London. The county is named for James Madison, President of the United States and was established on March 1, 1810. Madison County is part of the Columbus, OH Metropolitan Statistical Area.
History