Pacheco, CA has a population of 4,059 and is the 7,379th largest city in the United States. The population density is 5,478 per sq mi which is 2257% higher than the California average and 5946% higher than the national average. The median age in Pacheco is 42 which is approximately 16% higher than the California average of 36. In Pacheco, 46% of the population over 15 years of age are married, 77% speak English and 10% speak Spanish. 63% of Pacheco residents were born in California, 19% were born out of state, 3% were born outside of the United States and 16% were foreign born.