San Ramon, CA has a population of 74,366 and is the 478th largest city in the United States. The population density is 3,977 per sq mi which is 1611% higher than the California average and 4289% higher than the national average. The median age in San Ramon is 38 which is approximately 6% higher than the California average of 36. In San Ramon, 70% of the population over 15 years of age are married, 57% speak English and 4% speak Spanish. 48% of San Ramon residents were born in California, 16% were born out of state, 2% were born outside of the United States and 34% were foreign born.