Okmulgee is a city in the Tulsa metropolitan area and the county seat of Okmulgee County in Oklahoma, United States. As of the 2020 census, Okmulgee had a population of 11,322. The name is from the Muskogee word okimulgi, which means "boiling waters". The site was chosen because of the nearby rivers and springs. Okmulgee is 38 miles south of Tulsa and 13 miles north of Henryetta via US-75.