Oak Hills, CA has a population of 10,101 and is the 3,915th largest city in the United States. The population density is 414 per sq mi which is 78% higher than the California average and 357% higher than the national average. The median age in Oak Hills is 40 which is approximately 11% higher than the California average of 36. In Oak Hills, 68% of the population over 15 years of age are married, 79% speak English and 17% speak Spanish. 71% of Oak Hills residents were born in California, 15% were born out of state, 0% were born outside of the United States and 14% were foreign born.