Muscoy is a census-designated place (CDP) in San Bernardino County, California, United States. The population was 10,644 at the 2010 census, up from 8,919 at the 2000 census. Muscoy shares zip code 92407 with northwest San Bernardino, California's Verdemont neighborhood, Devore Heights, and Arrowhead Farms. Residents enjoy a semi-rural setting with large lots where they can raise horses and other livestock, nursery plants, and fruit trees. For this purpose, much of Muscoy is included in the county Additional Agriculture (AA) overlay. This overlay specifies types and quantities of animals that may be kept on each parcel.