Oakdale, CA has a population of 21,796 and is the 2,002nd largest city in the United States. The population density is 3,526 per sq mi which is 1417% higher than the California average and 3792% higher than the national average. The median age in Oakdale is 35 which is approximately 4% lower than the California average of 36. In Oakdale, 55% of the population over 15 years of age are married, 79% speak English and 18% speak Spanish. 76% of Oakdale residents were born in California, 14% were born out of state, 1% were born outside of the United States and 9% were foreign born.