Prairie Heights, WA has a population of 4,433 and is the 6,984th largest city in the United States. The population density is 1,185 per sq mi which is 1125% higher than the Washington average and 1207% higher than the national average. The median age in Prairie Heights is 35 which is approximately 6% lower than the Washington average of 38. In Prairie Heights, 59% of the population over 15 years of age are married, 94% speak English and 5% speak Spanish. 65% of Prairie Heights residents were born in Washington, 29% were born out of state, 1% were born outside of the United States and 5% were foreign born.