Davis, CA has a population of 66,886 and is the 553rd largest city in the United States. The population density is 6,765 per sq mi which is 2811% higher than the California average and 7367% higher than the national average. The median age in Davis is 26 which is approximately 29% lower than the California average of 36. In Davis, 40% of the population over 15 years of age are married, 70% speak English and 9% speak Spanish. 55% of Davis residents were born in California, 23% were born out of state, 2% were born outside of the United States and 20% were foreign born.