Tallmadge is a city in eastern Summit County, Ohio, United States, with a small district in neighboring Portage County. It is a suburb of Akron and part of the Akron metropolitan area. The population was 18,394 at the 2020 census. Tallmadge was founded in 1807 and is the second-oldest city in Summit County, following Hudson, which was founded in 1799.

Summit County is an urban county in the U.S. state of Ohio. As of the 2020 census, the population was 540,428, making it the fourth-most populous county in Ohio. Its county seat and largest city is Akron. The county was formed on March 3, 1840, from portions of Medina, Portage and Stark Counties. It was named Summit County because the highest elevation on the Ohio and Erie Canal is located in the county.