Brier, WA has a population of 6,530 and is the 5,442nd largest city in the United States. The population density is 2,964 per sq mi which is 2966% higher than the Washington average and 3172% higher than the national average. The median age in Brier is 48 which is approximately 26% higher than the Washington average of 38. In Brier, 68% of the population over 15 years of age are married, 86% speak English and 3% speak Spanish. 54% of Brier residents were born in Washington, 34% were born out of state, 1% were born outside of the United States and 11% were foreign born.