Hancock County is a county located in the U.S. state of Ohio. As of the 2020 census, the population was 74,920. Its county seat and largest city is Findlay. The county was created in 1820 and later organized in 1828. It was named for John Hancock, the first signer of the Declaration of Independence.

Findlay is a city in and the county seat of Hancock County, Ohio, United States. The second-largest city in Northwest Ohio, Findlay lies about 40 miles (64 km) south of Toledo. Its population was 40,313 at the 2020 census. The principal city of the Findlay micropolitan area, it is home to the University of Findlay and the headquarters of Fortune 100 company Marathon Petroleum.