Oceano, CA has a population of 8,262 and is the 4,594th largest city in the United States. The population density is 5,395 per sq mi which is 2221% higher than the California average and 5854% higher than the national average. The median age in Oceano is 37 which is approximately 3% higher than the California average of 36. In Oceano, 48% of the population over 15 years of age are married, 50% speak English and 46% speak Spanish. 58% of Oceano residents were born in California, 16% were born out of state, 3% were born outside of the United States and 23% were foreign born.