Oroville, WA has a population of 2,087 and is the 10,777th largest city in the United States. The population density is 1,235 per sq mi which is 1178% higher than the Washington average and 1264% higher than the national average. The median age in Oroville is 43 which is approximately 13% higher than the Washington average of 38. In Oroville, 53% of the population over 15 years of age are married, 89% speak English and 11% speak Spanish. 60% of Oroville residents were born in Washington, 28% were born out of state, 3% were born outside of the United States and 9% were foreign born.