Delaware County, Ohio

county in Ohio, United States

Delaware County is a county in the U.S. state of Ohio. As of the 2020 census, the population was 214,124.[3] Its county seat is Delaware.[4]

Delaware County
Delaware County Courthouse
Delaware County Courthouse
Official seal of Delaware County
Map of Ohio highlighting Delaware County
Location within the U.S. state of Ohio
Map of the United States highlighting 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[1]
Named forthe Delaware Indians
Largest cityDelaware*
 • Total457 sq mi (1,180 km2)
 • Land443 sq mi (1,150 km2)
 • Water14 sq mi (40 km2)  3.1%
 • Total214,124
 • Density470/sq mi (180/km2)
Time zoneUTC−5 (Eastern)
 • Summer (DST)UTC−4 (EDT)
Congressional districts4th, 12th
*Based on population just within the county.[2]


  1. "Ohio County Profiles: Delaware County" (PDF). Ohio Department of Development. Archived (PDF) from the original on 2014-05-12. Retrieved May 11, 2014.
  2. "Delaware County data (population)". Ohio State University Extension Data Center. Retrieved May 10, 2007.[permanent dead link]
  3. "QuickFacts: Delaware County, Ohio". United States Census Bureau. Retrieved January 18, 2024.
  4. National Association of Counties. "NACo County Explorer". Retrieved January 18, 2024.