Marina del Rey, CA has a population of 9,782 and is the 4,004th largest city in the United States. The population density is 11,380 per sq mi which is 4797% higher than the California average and 12460% higher than the national average. The median age in Marina del Rey is 39 which is approximately 9% higher than the California average of 36. In Marina del Rey, 33% of the population over 15 years of age are married, 69% speak English and 10% speak Spanish. 40% of Marina del Rey residents were born in California, 34% were born out of state, 2% were born outside of the United States and 25% were foreign born.