Olney Springs, CO has a population of 589 and is the 18,549th largest city in the United States. The population density is 2,448 per sq mi which is 4817% higher than the Colorado average and 2602% higher than the national average. The median age in Olney Springs is 26 which is approximately 29% lower than the Colorado average of 36. In Olney Springs, 47% of the population over 15 years of age are married, 91% speak English and 9% speak Spanish. 59% of Olney Springs residents were born in Colorado, 34% were born out of state, 0% were born outside of the United States and 6% were foreign born.