Okmulgee is a city in, and the county seat of, Okmulgee County, Oklahoma, United States. The name is from the Muskogee word okimulgee, 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.
Okmulgee has been the capital of the Muscogee (Creek) Nation since 1868, when it was founded following the Civil War. The Creek Nation began restoring order after that conflict. They had allied with the Confederacy during the war and needed to make a new peace treaty with the United States afterward as a result. They passed a new constitution and elected Samuel Checote as their first principal chief after the war.
In 1869, a post office (originally spelled Okmulkee) was established in the town, with Captain Frederick B. Severs appointed as the first postmaster. The name of the post office was officially changed to the present spelling on November 15, 1883. For seven years, beginning December 20, 1870, Okmulgee was the seat of government of all of what would become the State of Oklahoma, except for the Panhandle.