Brewster, WA has a population of 2,471 and is the 9,928th largest city in the United States. The population density is 2,144 per sq mi which is 2118% higher than the Washington average and 2267% higher than the national average. The median age in Brewster is 26 which is approximately 32% lower than the Washington average of 38. In Brewster, 59% of the population over 15 years of age are married, 33% speak English and 67% speak Spanish. 46% of Brewster residents were born in Washington, 19% were born out of state, 0% were born outside of the United States and 34% were foreign born.