Cyril, OK has a population of 1,124 and is the 14,430th largest city in the United States. The population density is 1,888 per sq mi which is 3358% higher than the Oklahoma average and 1983% higher than the national average. The median age in Cyril is 36 which is approximately 1% lower than the Oklahoma average of 36. In Cyril, 58% of the population over 15 years of age are married, 92% speak English and 5% speak Spanish. 76% of Cyril residents were born in Oklahoma, 20% were born out of state, 2% were born outside of the United States and 2% were foreign born.