Robinson Mill, CA has a population of 19 and is the 28,800th largest city in the United States. The population density is 14 per sq mi which is 94% lower than the California average and 84% lower than the national average. The median age in Robinson Mill is 0 which is approximately 100% lower than the California average of 36. In Robinson Mill, 0% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 100% of Robinson Mill residents were born in California, 0% were born out of state, 0% were born outside of the United States and 0% were foreign born.