Sunnyside, CA has a population of 4,066 and is the 7,374th largest city in the United States. The population density is 2,125 per sq mi which is 815% higher than the California average and 2246% higher than the national average. The median age in Sunnyside is 42 which is approximately 17% higher than the California average of 36. In Sunnyside, 55% of the population over 15 years of age are married, 65% speak English and 21% speak Spanish. 70% of Sunnyside residents were born in California, 15% were born out of state, 1% were born outside of the United States and 14% were foreign born.