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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