Fall River Mills, CA has a population of 304 and is the 22,430th largest city in the United States. The population density is 117 per sq mi which is 50% lower than the California average and 29% higher than the national average. The median age in Fall River Mills is 41 which is approximately 14% higher than the California average of 36. In Fall River Mills, 57% of the population over 15 years of age are married, 73% speak English and 26% speak Spanish. 68% of Fall River Mills residents were born in California, 12% were born out of state, 0% were born outside of the United States and 20% were foreign born.