Salmon Creek, WA has a population of 20,961 and is the 2,069th largest city in the United States. The population density is 3,303 per sq mi which is 3316% higher than the Washington average and 3545% higher than the national average. The median age in Salmon Creek is 42 which is approximately 10% higher than the Washington average of 38. In Salmon Creek, 60% of the population over 15 years of age are married, 90% speak English and 5% speak Spanish. 34% of Salmon Creek residents were born in Washington, 57% were born out of state, 1% were born outside of the United States and 7% were foreign born.