Patterson, CA has a population of 21,205 and is the 2,052nd largest city in the United States. The population density is 3,603 per sq mi which is 1307% higher than the California average and 3876% higher than the national average. The median age in Patterson is 31 which is approximately 15% lower than the California average of 36. In Patterson, 53% of the population over 15 years of age are married, 51% speak English and 43% speak Spanish. 64% of Patterson residents were born in California, 12% were born out of state, 2% were born outside of the United States and 22% were foreign born.