Granite Falls, WA has a population of 3,458 and is the 8,102nd largest city in the United States. The population density is 1,571 per sq mi which is 1525% higher than the Washington average and 1634% higher than the national average. The median age in Granite Falls is 37 which is approximately 1% lower than the Washington average of 38. In Granite Falls, 55% of the population over 15 years of age are married, 92% speak English and 6% speak Spanish. 58% of Granite Falls residents were born in Washington, 32% were born out of state, 1% were born outside of the United States and 10% were foreign born.