Rio Oso, CA has a population of 441 and is the 20,339th largest city in the United States. The population density is 68 per sq mi which is 71% lower than the California average and 25% lower than the national average. The median age in Rio Oso is 33 which is approximately 9% lower than the California average of 36. In Rio Oso, 46% of the population over 15 years of age are married, 77% speak English and 10% speak Spanish. 73% of Rio Oso residents were born in California, 15% were born out of state, 0% were born outside of the United States and 12% were foreign born.
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The population density in Rio Oso is 71% lower than California.
The median age in Rio Oso is 9% lower than California.
In Rio Oso 80.73% of the population is White.
In Rio Oso 0.00% of the population is Black or African American.