Plumas Lake, CA has a population of 6,434 and is the 5,505th largest city in the United States. The population density is 767 per sq mi which is 230% higher than the California average and 747% higher than the national average. The median age in Plumas Lake is 32 which is approximately 12% lower than the California average of 36. In Plumas Lake, 67% of the population over 15 years of age are married, 85% speak English and 9% speak Spanish. 64% of Plumas Lake residents were born in California, 23% were born out of state, 2% were born outside of the United States and 10% were foreign born.