San Andreas, CA has a population of 3,077 and is the 8,686th largest city in the United States. The population density is 367 per sq mi which is 58% higher than the California average and 305% higher than the national average. The median age in San Andreas is 42 which is approximately 16% higher than the California average of 36. In San Andreas, 57% of the population over 15 years of age are married, 95% speak English and 1% speak Spanish. 76% of San Andreas residents were born in California, 16% were born out of state, 0% were born outside of the United States and 7% were foreign born.