Tecumseh is a city in Pottawatomie County, Oklahoma. The population was 6,302 by the 2020 United States census. It was named for the noted Shawnee chief, Tecumseh. The locale was designated as the county seat at Oklahoma's statehood, but a county-wide election moved the seat to Shawnee in 1930.

Pottawatomie County is a county located in the U.S. state of Oklahoma. As of the 2020 census, the population was 72,454. Its county seat is Shawnee.