Peaceful Valley, WA has a population of 3,503 and is the 8,047th largest city in the United States. The population density is 207 per sq mi which is 114% higher than the Washington average and 128% higher than the national average. The median age in Peaceful Valley is 39 which is approximately 3% higher than the Washington average of 38. In Peaceful Valley, 50% of the population over 15 years of age are married, 77% speak English and 15% speak Spanish. 57% of Peaceful Valley residents were born in Washington, 25% were born out of state, 0% were born outside of the United States and 18% were foreign born.