- 1Delaware County FairDelaware, OhioEst. 1816September
The Delaware County Fair is one of Ohio's largest and oldest county fairs, with roots going back to 1816. Held north of Columbus, it draws upwards of 400,000 visitors over its week-long run. The fair is nationally famous as the home of the Little Brown Jug — one of harness racing's Triple Crown races — drawing 35,000 to 40,000 spectators on Little Brown Jug Thursday alone.
- 2Wayne County FairWooster, OhioEst. 1818September
The Wayne County Fair in Wooster is one of Ohio's oldest, dating to 1818. With roots going back to 1818, it's among Ohio's oldest continuously held fairs. Set in the heart of Ohio's Amish country, the fair reflects the deep agricultural traditions of one of the state's top dairy counties. Harness racing draws a strong following at the fair.
- 3Geauga County FairBurton, OhioEst. 1823September
The Geauga County Fair in Burton is one of the oldest continuously operating county fairs in Ohio, with a history stretching back to 1823. It's been held since 1823, one of Ohio's most enduring county fair traditions. Set in the maple syrup country of the Western Reserve, it draws visitors from across northeastern Ohio. The fair features harness racing as part of its lineup.
- 4Clermont County FairOwensville, OhioEst. 1835July
The Clermont County Fair in Owensville draws from one of the fastest-growing counties in the Cincinnati metro area, blending suburban energy with a strong agricultural tradition in the rolling hills east of Cincinnati. Founded in 1835, it stands as one of Ohio's most enduring agricultural fair traditions.
- 5Butler County FairHamilton, OhioEst. 1835July
The Butler County Fair is one of the oldest in southwestern Ohio, held annually in Hamilton. Dating to 1835, it ranks among Ohio's oldest agricultural fairs. It draws families from across the region for a week of agriculture, harness racing, and classic fair entertainment.
- 6Lorain County FairWellington, OhioEst. 1835August
The Lorain County Fair in Wellington has been a summer staple in northeastern Ohio since 1835, making it one of the state's oldest county fairs. Founded in 1835, it stands as one of Ohio's most enduring agricultural fair traditions. Harness racing is a featured event.
- 7Wood County FairBowling Green, OhioEst. 1837August
The Wood County Fair in Bowling Green is one of northwestern Ohio's premier summer events, drawing visitors from across the region. Its history stretches back to 1837, placing it among Ohio's oldest agricultural fairs. Harness racing draws a strong following at the fair.
- 8Fairfield County FairLancaster, OhioEst. 1841October
The Fairfield County Fair in Lancaster is one of Ohio's largest county fairs and one of the last major fairs of the season, running in mid-October. The fair traces back to 1841, making it one of Ohio's longest-running agricultural traditions. Its late date gives it a distinctive autumn atmosphere. Harness racing remains part of the fair's tradition.
- 9Defiance County FairHicksville, OhioEst. 1845August
The Defiance County Fair is held in Hicksville — not the city of Defiance — serving the farming communities of far northwestern Ohio at the Indiana border. With roots going back to 1845, it's among Ohio's oldest continuously held fairs. Local harness racing fans turn out for the fair every year.
- 10Columbiana County FairLisbon, OhioEst. 1845August
The Columbiana County Fair in Lisbon serves the farming and small-town communities of northeastern Ohio along the Pennsylvania border, with harness racing featured throughout the week. It's been held since 1845, one of Ohio's most enduring county fair traditions.
- 11Knox County FairMount Vernon, OhioEst. 1845July
The Knox County Fair in Mount Vernon is one of the premier agricultural events in central Ohio's heartland, drawing from a county with a strong farming identity and one of the state's most picturesque county seats. Its history stretches back to 1845, placing it among Ohio's oldest agricultural fairs. The fair includes harness racing among its attractions.
- 12Ross County FairChillicothe, OhioEst. 1845August
The Ross County Fair in Chillicothe draws from one of Ohio's most historically significant regions — the first and third capital of the state — and has been a community tradition since 1845. The fair traces back to 1845, making it one of Ohio's longest-running agricultural traditions. Harness racing draws a strong following at the fair.
- 13Logan County FairBellefontaine, OhioEst. 1845July
The Logan County Fair in Bellefontaine has been a July tradition in west-central Ohio since 1845. It's been held since 1845, one of Ohio's most enduring county fair traditions. Bellefontaine is home to both the highest point in Ohio and the first concrete street in America.
- 14Coshocton County FairCoshocton, OhioEst. 1845October
The Coshocton County Fair is one of Ohio's latest county fairs, running into October in east-central Ohio's canal country. Dating to 1845, it ranks among Ohio's oldest agricultural fairs. It serves the farming communities of a county known for its history along the Ohio and Erie Canal and Roscoe Village.
- 15Marion County FairMarion, OhioEst. 1845June
The Marion County Fair bridges June and July, running from late June through the Fourth of July week. Founded in 1845, it stands as one of Ohio's most enduring agricultural fair traditions. It has been a summer institution in north-central Ohio since 1845, with harness racing as a signature attraction.