Fostoria is a city located at the convergence of Hancock, Seneca, and Wood counties in the northwestern part of the U.S. state of Ohio. The population was 13,046 at the 2020 Census, slightly down from 13,441 at the 2010 Census. It is approximately 40 miles (64 km) south of Toledo and 90 miles (140 km) north of Columbus. The community grew substantially during the end of the 19th century, coinciding with the northwest Ohio gas boom. Typical of Rust Belt cities, Fostoria peaked in size in 1970.

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.