Stevenson, WA has a population of 1,454 and is the 12,878th largest city in the United States. The population density is 884 per sq mi which is 814% higher than the Washington average and 875% higher than the national average. The median age in Stevenson is 46 which is approximately 23% higher than the Washington average of 38. In Stevenson, 50% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 29% of Stevenson residents were born in Washington, 69% were born out of state, 1% were born outside of the United States and 1% were foreign born.