Winchester, OK has a population of 507 and is the 19,448th largest city in the United States. The population density is 94 per sq mi which is 72% higher than the Oklahoma average and 4% higher than the national average. The median age in Winchester is 44 which is approximately 21% higher than the Oklahoma average of 36. In Winchester, 62% of the population over 15 years of age are married, 96% speak English and 4% speak Spanish. 58% of Winchester residents were born in Oklahoma, 39% were born out of state, 0% were born outside of the United States and 3% were foreign born.