Patterson is a city in Stanislaus County, California, United States, located off Interstate 5. It is 27 miles southeast of Tracy and is part of the Modesto Metropolitan Statistical Area. Patterson is known as the "Apricot Capital of the World"; the town holds an annual Apricot Fiesta to celebrate with many drinks, food, desserts and games. Also, in the past two years Patterson has been the site of the Fiestas Patrias celebration, commemorating the independence of various Latin American countries. This celebration is held in mid- September. The population was 20,413 at the 2010 census, up from 11,606 at the 2000 census.