Sapulpa, OK has a population of 20,546 and is the 2,111th largest city in the United States. The population density is 914 per sq mi which is 1574% higher than the Oklahoma average and 908% higher than the national average. The median age in Sapulpa is 38 which is approximately 4% higher than the Oklahoma average of 36. In Sapulpa, 59% of the population over 15 years of age are married, 95% speak English and 3% speak Spanish. 70% of Sapulpa residents were born in Oklahoma, 26% were born out of state, 0% were born outside of the United States and 3% were foreign born.