Chehalis, WA has a population of 7,340 and is the 5,008th largest city in the United States. The population density is 1,264 per sq mi which is 1208% higher than the Washington average and 1295% higher than the national average. The median age in Chehalis is 34 which is approximately 11% lower than the Washington average of 38. In Chehalis, 48% of the population over 15 years of age are married, 89% speak English and 9% speak Spanish. 61% of Chehalis residents were born in Washington, 33% were born out of state, 2% were born outside of the United States and 4% were foreign born.