Mã bưu chính Maryland (MD)
Hạt
24Allegany County 22Anne Arundel County 43Baltimore County 53Baltimore (city) County 39Calvert County 14Caroline County 11Carroll County 13Cecil County 17Charles County 24Dorchester County 16Frederick County 31Garrett County 9Harford County 21Howard County 22Kent County 9Montgomery County 76Prince George's County 64Queen Anne's County 13Somerset County 11St. Mary's County 29Talbot County 15Washington County 23Wicomico County 18Worcester County 12