Delaware County, Ohio

Delaware County
Location within the U.S. state of Ohio
Ohio's location within the U.S.
Coordinates: 40°17′N 83°01′W / 40.28°N 83.01°W / 40.28; -83.01
Country United States
State Ohio
FoundedFebruary 10, 1808
Named afterthe Delaware Indians
SeatDelaware
Largest cityDelaware
Area
  Total
457 sq mi (1,180 km2)
  Land443 sq mi (1,150 km2)
  Water14 sq mi (40 km2)  3.1%
Population
 (2020)
  Total
214,124
  Estimate 
(2022)
226,296
  Density470/sq mi (180/km2)
Time zoneUTC−5 (Eastern)
  Summer (DST)UTC−4 (EDT)
Congressional districts4th, 12th
Websitewww.co.delaware.oh.us
*Based on population just within the county.

Delaware County is a county located in the central portion of the U.S. state of Ohio. As of the 2020 census, the population was 214,124. Its county seat and largest city is Delaware. The county was formed in 1808 from Franklin County, Ohio. Both the county and its seat are named after the Delaware Indian tribe. It is a frequent placeholder on the List of highest-income counties in the United States; Delaware County was listed as the 35th wealthiest county in the United States in 2020. Delaware County is included in the Columbus, Ohio, metropolitan area. U.S. President Rutherford B. Hayes was born and raised in Delaware County. It is also home to the Columbus Zoo and Aquarium.