Sapulpa is a city in Creek and Tulsa counties in the U.S. state of Oklahoma. The population was 20,544 at the 2010 United States census, compared to 19,166 at the 2000 census. As of 2019 the estimated population was 21,278. It is the county seat of Creek County.
The town was named after the area's first permanent settler, a full-blood Lower Creek Indian named Sapulpa, of the Kasihta tribe, from Osocheetown in present-day Alabama]]. About 1850, he established a trading post near the meeting of Polecat and Rock creeks (about one mile (1.6 km) southeast of present-day downtown Sapulpa). When the Atlantic and Pacific Railroad (later known as the Frisco) built a spur to this area in 1886, it was known as Sapulpa Station. The Sapulpa post office was chartered July 1, 1889. The town was incorporated March 31, 1898.
After Oklahoma became a state, each county held an election to determine the location of the county seat. Sapulpa competed with Bristow as the county seat of Creek County. After five years of contested elections and court suits, the question was settled by the Oklahoma Supreme Court on August 1, 1913.