Madison County | |
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![]() Location within the U.S. state of Ohio | |
![]() Ohio's location within the U.S. | |
Coordinates: 39°54′N 83°24′W / 39.9°N 83.4°W | |
Country | ![]() |
State | ![]() |
Founded | February 16, 1810[1][2] |
Named for | James Madison[3] |
Seat | London |
Largest city | London |
Area | |
• Total | 467 sq mi (1,210 km2) |
• Land | 466 sq mi (1,210 km2) |
• Water | 0.8 sq mi (2 km2) 0.2% |
Population (2020) | |
• Total | 43,824 |
• Density | 94/sq mi (36/km2) |
Time zone | UTC−5 (Eastern) |
• Summer (DST) | UTC−4 (EDT) |
Congressional district | 15th |
Website | www |
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.[4] Its county seat is London.[5] The county is named for James Madison, President of the United States and was established on March 1, 1810.[6] Madison County is part of the Columbus, OH Metropolitan Statistical Area.