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Delaware County, Ohio facts for kids

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Delaware County
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.
Country  United States
State  Ohio
Founded February 10, 1808
Named for the Delaware Indians
Seat Delaware
Largest city Delaware
 • Total 457 sq mi (1,180 km2)
 • Land 443 sq mi (1,150 km2)
 • Water 14 sq mi (40 km2)  3.1%%
 • Estimate 
 • Density 393/sq mi (152/km2)
Time zone UTC−5 (Eastern)
 • Summer (DST) UTC−4 (EDT)
Congressional district 12th
  • Based on population just within the county.

Delaware County is a county in the U.S. state of Ohio. As of the 2010 census, the population was 174,214. Its county seat 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.

Delaware County is included in the Columbus, OH Metropolitan Statistical Area.

U. S. President Rutherford B. Hayes was born and grew up in Delaware County. It is also home to the Columbus Zoo and Aquarium.


In 2008, Forbes magazine ranks Delaware County as the fifth best place in the United States to raise a family and the second best in Ohio, behind Geauga County.


According to the U.S. Census Bureau, the county has a total area of 457 square miles (1,180 km2), of which 443 square miles (1,150 km2) is land and 14 square miles (36 km2) (3.1%) is water. The county has an even terrain and a fertile soil.

Adjacent counties

Lakes and rivers

The major rivers of the county are the Scioto River, Olentangy River, Alum Creek, and the Big Walnut Creek. These waterways run from north to south across the county. The Alum Creek Lake and the Delaware Lake are reservoirs created on Alum Creek and the Olentangy River, respectively.


Historical population
Census Pop.
1810 2,000
1820 7,639 282.0%
1830 11,504 50.6%
1840 22,060 91.8%
1850 21,817 −1.1%
1860 23,902 9.6%
1870 25,175 5.3%
1880 27,381 8.8%
1890 27,189 −0.7%
1900 26,401 −2.9%
1910 27,182 3.0%
1920 26,013 −4.3%
1930 26,016 0.0%
1940 26,780 2.9%
1950 30,278 13.1%
1960 36,107 19.3%
1970 42,908 18.8%
1980 53,840 25.5%
1990 66,929 24.3%
2000 109,989 64.3%
2010 174,214 58.4%
2015 (est.) 193,013 10.8%
U.S. Decennial Census
1790-1960 1900-1990
1990-2000 2010-2013

2010 census

As of the 2010 United States Census, there were 174,214 people, 62,760 households, and 47,977 families residing in the county. The population density was 393.2 inhabitants per square mile (151.8/km2). There were 66,378 housing units at an average density of 149.8 per square mile (57.8/km2). The racial makeup of the county was 89.7% white, 4.3% Asian, 3.4% black or African American, 0.1% American Indian, 0.6% from other races, and 1.8% from two or more races. Those of Hispanic or Latino origin made up 2.1% of the population. In terms of ancestry, 34.2% were German, 16.3% were Irish, 14.0% were English, 8.1% were Italian, and 5.7% were American.

Of the 62,760 households, 41.9% had children under the age of 18 living with them, 65.8% were married couples living together, 7.3% had a female householder with no husband present, 23.6% were non-families, and 19.0% of all households were made up of individuals. The average household size was 2.74 and the average family size was 3.16. The median age was 37.4 years.

The median income for a household in the county was $87,908 and the median income for a family was $101,698. Males had a median income of $70,949 versus $48,913 for females. The per capita income for the county was $40,682. About 3.4% of families and 4.6% of the population were below the poverty line, including 4.8% of those under age 18 and 5.4% of those age 65 or over.



Interstate 71 and U.S. Highway 23 pass through the county. Interstate 71 crosses over Alum Creek immediately south of the Alum Creek Lake recreation area.


The area is served by the Delaware Municipal Airport, which is strategically located to serve the rapidly developing southern Delaware County area and the north portion of the Franklin County and Columbus, Ohio, areas. The airport contains a 5,000 foot runway, flight terminal, lounges, and weather briefing areas. It is home to approximately 80 aircraft and an estimated 40,000 operations take place per year. Several smaller airports are located in the county.

Points of interest

Delaware, Ohio is famous for The Little Brown Jug, an internationally famous harness race which is part of the Triple Crown of harness racing.

The Methodist Theological School in Ohio is the Methodist graduate school seminary located between Delaware and Columbus, Ohio. It is often referred to as METHESCO.

Additional notable places include:

  • Delaware Municipal Airport Annual Air Fair
  • Columbus Zoo and Aquarium
  • Zoombezi Bay waterpark
  • Safari Golf club
  • The Germain Amphitheater, formerly the Polaris Amphitheater, closed at the end of 2007
  • Alum Creek State Park and the Delaware State Park bring millions of local, national, and international visitors to the area each year.
  • The site of the first Ohio State University football game
  • The Hamburger Inn at 16 N. Sandusky
  • Historical Marker of Rutherford B. Hayes' home on E. William St.
  • The Strand Theater.
  • Polaris centers of commerce (Big commercial business area including Americas 2nd largest low rise office building - the chase McCoy center - and the high end Polaris fashion place mall)


Map of Delaware County Ohio With Municipal and Township Labels
Map of Delaware County, Ohio with Municipal and Township Labels



Census-designated places

Unincorporated communities


  • Berkshire
  • Berlin
  • Brown
  • Concord
  • Delaware
  • Genoa
  • Harlem
  • Kingston
  • Liberty
  • Marlboro
  • Orange
  • Oxford
  • Porter
  • Radnor
  • Scioto
  • Thompson
  • Trenton
  • Troy
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