Warrenton, OR has a population of 5,260 and is the 6,237th largest city in the United States. The population density is 416 per sq mi which is 949% higher than the Oregon average and 359% higher than the national average. The median age in Warrenton is 35 which is approximately 12% lower than the Oregon average of 39. In Warrenton, 57% of the population over 15 years of age are married, 89% speak English and 9% speak Spanish. 52% of Warrenton residents were born in Oregon, 42% were born out of state, 1% were born outside of the United States and 5% were foreign born.