Loma Mar is a census-designated place (CDP) in San Mateo County, California. It is near San Mateo County Memorial Park on Pescadero Road and is in area code 650. Loma Mar is between the towns of Pescadero and La Honda, situated in the Santa Cruz Mountains in the western part of the San Francisco Peninsula. The United States Postal Service has assigned it ZIP Code 94021. As of the census of 2010, there were 113 residents in the CDP. Loma Mar is home to the YMCA's Camp Loma Mar.