Oakland, CA has a population of 412,040 and is the 45th largest city in the United States. The population density is 7,372 per sq mi which is 3072% higher than the California average and 8036% higher than the national average. The median age in Oakland is 36 which is approximately 1% higher than the California average of 36. In Oakland, 44% of the population over 15 years of age are married, 60% speak English and 22% speak Spanish. 49% of Oakland residents were born in California, 22% were born out of state, 2% were born outside of the United States and 27% were foreign born.