Piedmont is a city primarily in Canadian County, Oklahoma, United States, though a small part of it is in Kingfisher County. It is a part of the Oklahoma City Metropolitan Area. The population was 5,720 at the 2010 census, a 56.7 percent increase from 3,650 in 2000. Piedmont is a home rule city served by a council–manager government.

Canadian County is a county located in the U.S. state of Oklahoma. As of the 2020 census, the population was 154,405, making it the fourth most populous county in Oklahoma. Its county seat is El Reno.