Franklin County, Ohio

county in Ohio, United States

Franklin County is a county in the U.S. state of Ohio. As of 2020, the population was 1,323,807,[2] making it the most populous county in Ohio. Its county seat is Columbus,[3] the state capital and most populous city in Ohio.

Franklin County
Franklin County Government Center
Franklin County Government Center
Flag of Franklin County
Official seal of Franklin County
Map of Ohio highlighting Franklin County
Location within the U.S. state of Ohio
Map of the United States highlighting Ohio
Ohio's location within the U.S.
Coordinates: 39°58′N 83°01′W / 39.97°N 83.01°W / 39.97; -83.01
Country United States
State Ohio
FoundedApril 30, 1803[1]
Named forBenjamin Franklin
Largest cityColumbus
 • Total544 sq mi (1,410 km2)
 • Land532 sq mi (1,380 km2)
 • Water11 sq mi (30 km2)  2.1%
 • Total1,323,807
 • Density2,486/sq mi (960/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional districts3rd, 15th


  1. "Ohio County Profiles: Franklin County" (PDF). Ohio Department of Development. Archived from the original (PDF) on June 21, 2007. Retrieved April 28, 2007.
  2. "QuickFacts: Franklin County, Ohio". United States Census Bureau. Retrieved January 18, 2024.
  3. National Association of Counties. "NACo County Explorer". Retrieved January 18, 2024.