Mission, OR has a population of 932 and is the 15,576th largest city in the United States. The population density is 122 per sq mi which is 209% higher than the Oregon average and 35% higher than the national average. The median age in Mission is 27 which is approximately 30% lower than the Oregon average of 39. In Mission, 34% of the population over 15 years of age are married, 89% speak English and 2% speak Spanish. 67% of Mission residents were born in Oregon, 29% were born out of state, 2% were born outside of the United States and 2% were foreign born.