Lake Stevens, WA has a population of 30,352 and is the 1,403rd largest city in the United States. The population density is 3,416 per sq mi which is 3433% higher than the Washington average and 3670% higher than the national average. The median age in Lake Stevens is 34 which is approximately 10% lower than the Washington average of 38. In Lake Stevens, 60% of the population over 15 years of age are married, 90% speak English and 6% speak Spanish. 57% of Lake Stevens residents were born in Washington, 34% were born out of state, 2% were born outside of the United States and 7% were foreign born.