Kiefer is a town in Creek County, Oklahoma, United States.

[5] Kiefer was originally known as "Praper" when a post office was first established in 1901.

Praper became an oil boom town by 1906, when it grew into a major shipping point for crude from the Glenn Pool field.

[6] In the early days, Kiefer was on the route of the Sapulpa & Interurban Railway (“S&I”) streetcar/interurban line connecting to Tulsa through Sapulpa; S&I subsequently went through a series of mergers and name changes, with only the Tulsa-to-Sapulpa portion continuing as the Tulsa-Sapulpa Union Railway.

[6] However, it is also headquarters for Bridge Crane Specialists, a company involved in the design, manufacturing, installation, and servicing of overhead and work station crane systems.

U.S. Highway 75A passes through the center of the town, leading north 5 miles (8 km) to the center of Sapulpa, the county seat, and south 5 miles (8 km) to Mounds.

Oklahoma State Highway 67 leads east from Kiefer 3 miles (5 km) to the U.S. Route 75 freeway in Glenpool.

20.4% of all households were made up of individuals, and 5.1% had someone living alone who was 65 years of age or older.