Pendleton, OR has a population of 16,861 and is the 2,539th largest city in the United States. The population density is 1,562 per sq mi which is 3845% higher than the Oregon average and 1625% higher than the national average. The median age in Pendleton is 37 which is approximately 4% lower than the Oregon average of 39. In Pendleton, 52% of the population over 15 years of age are married, 94% speak English and 4% speak Spanish. 55% of Pendleton residents were born in Oregon, 41% were born out of state, 2% were born outside of the United States and 2% were foreign born.