Jennings, OK has a population of 304 and is the 22,429th largest city in the United States. The population density is 553 per sq mi which is 913% higher than the Oklahoma average and 510% higher than the national average. The median age in Jennings is 38 which is approximately 4% higher than the Oklahoma average of 36. In Jennings, 59% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 71% of Jennings residents were born in Oklahoma, 29% were born out of state, 0% were born outside of the United States and 0% were foreign born.