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Note: These Zip Code boundaries reflect U.S. Postal Service delivery area. They are not the same as the U.S. Census Bureau Zip Code Tabulation Areas (ZCTAs). Later this year, we will obtain the geographic boundaries for the ZCTAs.
Allegany County
Anne Arundel County
Baltimore County
Calvert County
Caroline County
Carroll County
Cecil County
Charles County
Dorchester County
Frederick County
Garrett County
Harford County
Howard County
Kent County
Montgomery County
Prince George's County
Queen Anne's County
St. Mary's County
Somerset County
Talbot County
Washington County
Wicomico County
Worcester County
Baltimore City
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