Shadow Lake, WA has a population of 2,755 and is the 9,237th largest city in the United States. The population density is 530 per sq mi which is 448% higher than the Washington average and 485% higher than the national average. The median age in Shadow Lake is 46 which is approximately 22% higher than the Washington average of 38. In Shadow Lake, 64% of the population over 15 years of age are married, 97% speak English and 2% speak Spanish. 49% of Shadow Lake residents were born in Washington, 44% were born out of state, 0% were born outside of the United States and 8% were foreign born.