Berkeley, CA has a population of 115,688 and is the 237th largest city in the United States. The population density is 11,054 per sq mi which is 4523% higher than the California average and 12101% higher than the national average. The median age in Berkeley is 31 which is approximately 13% lower than the California average of 36. In Berkeley, 37% of the population over 15 years of age are married, 73% speak English and 7% speak Spanish. 47% of Berkeley residents were born in California, 31% were born out of state, 2% were born outside of the United States and 21% were foreign born.