Okmulgee is a city in Okmulgee County, Oklahoma, United States. The 2009 population estimate was 12,558. It is the county seat of Okmulgee County. The town has been the capital of the Muscogee (Creek) Nation since the United States Civil War. Okmulgee means "boiling waters" in the Creek language. The site was chosen because of the nearby rivers and springs.
Okmulgee is located at 35°37′28″N 95°57′48″W / 35.62444°N 95.96333°W / 35.62444; -95.96333 (35.624558, -95.963254).
According to the United States Census Bureau, the city has a total area of 33.8 square miles (33.2 km²), all of it land. Actually, Okmulgee means "babbling brook", it is also translated as 'Effluvium'. It's located in the heart of Oklahoma's "Green Country", in the North East Quadrant of Oklahoma. It is also home to Oklahoma State University Institute of Technology.