Hereford is an unincorporated community in Baltimore County, Maryland, United States. Hereford most commonly refers to the stores and residences around Exit 27, off Interstate 83, including Graul's Market, an M&T Bank branch, and an Exxon gas station. Mount Carmel Road and York Road act as vital corridors into, out of, and within the Hereford community. Hereford is best known for its acclaimed high school and unique microclimate which differs significantly from other Baltimore County communities. Addresses in Hereford are listed as being in Parkton, which also encompasses the northern Baltimore County community of Maryland Line.