Prairie City, OR has a population of 868 and is the 16,037th largest city in the United States. The population density is 875 per sq mi which is 2110% higher than the Oregon average and 866% higher than the national average. The median age in Prairie City is 40 which is approximately 3% higher than the Oregon average of 39. In Prairie City, 64% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 68% of Prairie City residents were born in Oregon, 32% were born out of state, 0% were born outside of the United States and 0% were foreign born.