Bethany, OK has a population of 19,582 and is the 2,224th largest city in the United States. The population density is 3,745 per sq mi which is 6358% higher than the Oklahoma average and 4034% higher than the national average. The median age in Bethany is 35 which is approximately 4% lower than the Oklahoma average of 36. In Bethany, 51% of the population over 15 years of age are married, 87% speak English and 11% speak Spanish. 59% of Bethany residents were born in Oklahoma, 31% were born out of state, 1% were born outside of the United States and 8% were foreign born.