The state Maryland has 605 different ZIP Codes among its 1 distinct locations. The postal code range goes from 20588 to 21930.
Allegany
Anne Arundel
Baltimore
Baltimore (city)
Calvert
Caroline
Carroll
Cecil
Charles
Dorchester
Frederick
Garrett
Harford
Howard
Kent
Montgomery
Prince George's
Queen Anne's
Somerset
St. Mary's
Talbot
Washington
Wicomico
Worcester