Oasis, CA has a population of 4,374 and is the 7,036th largest city in the United States. The population density is 223 per sq mi which is 4% lower than the California average and 146% higher than the national average. The median age in Oasis is 25 which is approximately 32% lower than the California average of 36. In Oasis, 55% of the population over 15 years of age are married, 2% speak English and 98% speak Spanish. 41% of Oasis residents were born in California, 2% were born out of state, 1% were born outside of the United States and 56% were foreign born.