Muscoy, CA has a population of 13,025 and is the 3,205th largest city in the United States. The population density is 4,144 per sq mi which is 1683% higher than the California average and 4474% higher than the national average. The median age in Muscoy is 25 which is approximately 32% lower than the California average of 36. In Muscoy, 44% of the population over 15 years of age are married, 23% speak English and 75% speak Spanish. 62% of Muscoy residents were born in California, 5% were born out of state, 0% were born outside of the United States and 32% were foreign born.