About Camp Pendleton Mainside CDP, California
Camp Pendleton Mainside is a census-designated place (CDP) in San Diego County, California. The population was 3,432 at the 2010 census. The CDP includes the main base of the United States Marine Corps’ Camp Pendleton.
Mainside is home to the 1st Marine Division, 3rd Marine Aircraft Wing, and other tenant units. The base was established in 1942 and is now the largest employer in North County.
Camp Pendleton Mainside has a Mediterranean climate. The average temperatures are moderate with little variation year-round. rainfall is spread evenly throughout the year, totaling about 10 inches annually.