Yermo is a town in San Bernardino County, California. Its name is derived from the Spanish word for desert. It is located 13 miles east of Barstow in the Mojave Desert on Interstate 15, just south of the Calico Mountains. The town has a population of 1,500-2,000 (2009). The town is governed by an elected 5 member Board of Directors comprising the Community Services District authorized by the County of San Bernardino. The board meets once monthly. The CSD retains the following powers: Volunteer fire department, (Yermo/Calico V.F.D. ), street lighting, parks and water maintenance. The ZIP Code is 92398, and the community is inside area code 760. Yermo has a "P.O. Box Only" U.S.P.S. delivery office. There is no street address delivery offered. Yermo hosts the 1859 acre (7.5 km) storage and industrial annex of the Marine Corps Logistics Base Barstow.