Cathcart, WA has a population of 2,665 and is the 9,439th largest city in the United States. The population density is 690 per sq mi which is 614% higher than the Washington average and 662% higher than the national average. The median age in Cathcart is 49 which is approximately 31% higher than the Washington average of 38. In Cathcart, 69% of the population over 15 years of age are married, 96% speak English and 0% speak Spanish. 56% of Cathcart residents were born in Washington, 36% were born out of state, 2% were born outside of the United States and 6% were foreign born.