Stevenson Ranch, CA has a population of 19,737 and is the 2,207th largest city in the United States. The population density is 3,105 per sq mi which is 1113% higher than the California average and 3327% higher than the national average. The median age in Stevenson Ranch is 38 which is approximately 6% higher than the California average of 36. In Stevenson Ranch, 63% of the population over 15 years of age are married, 72% speak English and 7% speak Spanish. 54% of Stevenson Ranch residents were born in California, 22% were born out of state, 1% were born outside of the United States and 22% were foreign born.