San Geronimo, CA has a population of 597 and is the 18,472nd largest city in the United States. The population density is 396 per sq mi which is 55% higher than the California average and 337% higher than the national average. The median age in San Geronimo is 41 which is approximately 14% higher than the California average of 36. In San Geronimo, 38% of the population over 15 years of age are married, 85% speak English and 0% speak Spanish. 44% of San Geronimo residents were born in California, 46% were born out of state, 5% were born outside of the United States and 5% were foreign born.
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The population density in San Geronimo is 55% higher than California.
The median age in San Geronimo is 14% higher than California.
In San Geronimo 100.00% of the population is White.
In San Geronimo 0.00% of the population is Black or African American.