Shelton, WA has a population of 9,832 and is the 3,989th largest city in the United States. The population density is 1,695 per sq mi which is 1653% higher than the Washington average and 1771% higher than the national average. The median age in Shelton is 36 which is approximately 3% lower than the Washington average of 38. In Shelton, 45% of the population over 15 years of age are married, 85% speak English and 14% speak Spanish. 56% of Shelton residents were born in Washington, 33% were born out of state, 0% were born outside of the United States and 11% were foreign born.