At California and Arizona Marine Corps installations, 3,581 employees are subject to emergency furloughs, according to officials with Camp Pendleton's public affairs office.
Public safety employees and employees that provide necessary utility services are exempt. Military pay was not affected.
Naval Hospital Camp Pendleton will remain open, as will its seven branch clinics, officials said.
Also the Cabrillo National Monument and recreational facilities in the Cleveland National Forest are closed due to the shutdown.