Benson is an unincorporated community in Harford County, Maryland, United States. Benson is located at the Harford county junction of U.S. Route 1 and Maryland Route 147, southwest of Bel Air and 19.45 miles (31.3 km) northeast of Baltimore. Benson has a post office with ZIP code 21018 and is served by the Area Codes 410, 443 and 667. History The unincorporated community of Benson was shown to have a population of 42 people in 1895 with a functioning Post Office but no railroad services according to the Rand McNally Atlas. References Unincorporated communities in Harford County, Maryland Unincorporated communities in Maryland