Fairfield County
Also known as Fairfield County, Ohio, Fairfield County, OH
county in Ohio, United States
Key facts
- Country
- United States
- State
- Ohio
- Founded
- December 9, 1800
- Named after
- the Fairfield area of Lancaster, Lancashire , UK
- Seat
- Lancaster
- Largest city
- Lancaster
- Total
- 509 sq mi (1,320 km )
- Land
- 504 sq mi (1,310 km )
- Water
- 4.2 sq mi (11 km ) 0.8%
- Estimate 2025
- 169,752
- Density
- 310/sq mi (120/km )
- Time zone
- UTC−5 ( Eastern )
- Summer dst
~10 min read
Article
Fairfield County is located in the U.S. state of Ohio. As of the 2020 census, the population was 158,921. Its county seat and largest city is Lancaster. Its name is a reference to the Fairfield area of the original Lancaster. Fairfield County is part of the Columbus, OH Metropolitan Statistical Area.
History