Bunk Foss, WA has a population of 3,484 and is the 8,068th largest city in the United States. The population density is 900 per sq mi which is 831% higher than the Washington average and 893% higher than the national average. The median age in Bunk Foss is 44 which is approximately 16% higher than the Washington average of 38. In Bunk Foss, 65% of the population over 15 years of age are married, 93% speak English and 2% speak Spanish. 60% of Bunk Foss residents were born in Washington, 34% were born out of state, 1% were born outside of the United States and 4% were foreign born.