Danville, CA has a population of 43,758 and is the 938th largest city in the United States. The population density is 2,421 per sq mi which is 942% higher than the California average and 2572% higher than the national average. The median age in Danville is 45 which is approximately 26% higher than the California average of 36. In Danville, 70% of the population over 15 years of age are married, 83% speak English and 3% speak Spanish. 59% of Danville residents were born in California, 26% were born out of state, 1% were born outside of the United States and 14% were foreign born.