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. 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.
According to the United States Census Bureau, the CDP covers an area of 1.7 square miles (4.5 km²), all of it land.
The 2010 United States Census reported that Loma Mar had a population of 113. The population density was 65.1 people per square mile (25.2/km²). The racial makeup of Loma Mar was 101 (89.4%) White, 2 (1.8%) African American, 0 (0.0%) Native American, 3 (2.7%) Asian, 0 (0.0%) Pacific Islander, 0 (0.0%) from other races, and 7 (6.2%) from two or more races. Hispanic orLatino of any race were 12 persons (10.6%).