Lake Arrowhead is an unincorporated community and a census-designated place in the San Bernardino Mountains of San Bernardino County, California, surrounded by the San Bernardino National Forest, and surrounding the eponymous Lake Arrowhead Reservoir. Lake Arrowhead is located 13 miles north east of the San Bernardino city limits. The population of the CDP was estimated at 12,424 in the 2010 census.