Three Rivers, CA has a population of 2,001 and is the 11,025th largest city in the United States. The population density is 45 per sq mi which is 81% lower than the California average and 50% lower than the national average. The median age in Three Rivers is 57 which is approximately 59% higher than the California average of 36. In Three Rivers, 63% of the population over 15 years of age are married, 94% speak English and 5% speak Spanish. 64% of Three Rivers residents were born in California, 28% were born out of state, 0% were born outside of the United States and 8% were foreign born.