Kingston, WA has a population of 1,859 and is the 11,462nd largest city in the United States. The population density is 996 per sq mi which is 931% higher than the Washington average and 1000% higher than the national average. The median age in Kingston is 49 which is approximately 30% higher than the Washington average of 38. In Kingston, 54% of the population over 15 years of age are married, 99% speak English and 0% speak Spanish. 45% of Kingston residents were born in Washington, 49% were born out of state, 1% were born outside of the United States and 5% were foreign born.