Kettle Falls, WA has a population of 1,447 and is the 12,907th largest city in the United States. The population density is 1,363 per sq mi which is 1310% higher than the Washington average and 1404% higher than the national average. The median age in Kettle Falls is 48 which is approximately 28% higher than the Washington average of 38. In Kettle Falls, 67% of the population over 15 years of age are married, 98% speak English and 1% speak Spanish. 56% of Kettle Falls residents were born in Washington, 41% were born out of state, 0% were born outside of the United States and 2% were foreign born.