El Cajon, CA

ZIP code 92020 covers much of central El Cajon in San Diego County, east of San Diego. Notable landmarks include the Olaf Wieghorst Museum and Western Heritage Center, the Knox House Museum, the historic downtown district around Main Street, and Parkway Plaza. Gillespie Field, a general-aviation airport with an aviation museum annex, is also in the area, alongside civic, commercial, and residential neighborhoods.