U.S. POSTAL CODE DIRECTORY

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Directory coverage 42,735 ZIP Code records

Harford County Zip Codes

County	State	Zip Code	City	Area Codes
Harford County	MD	21001	Aberdeen	410, 443, 667
Harford County	MD	21005	Aberdeen Proving Ground	410, 443, 667
Harford County	MD	21009	Abingdon	410, 443, 667
Harford County	MD	21010	Gunpowder	410, 443, 667
Harford County	MD	21014	Bel Air	410, 443, 667
Harford County	MD	21015	Bel Air	410, 443, 667
Harford County	MD	21017	Belcamp	410, 443, 667
Harford County	MD	21018	Benson	410
Harford County	MD	21028	Churchville	410, 443, 667
Harford County	MD	21034	Darlington	410, 443, 667

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ZIP codes are a system of postal codes used by the United States Postal Service (USPS) since 1963. The term ZIP, an acronym for Zone Improvement Plan, is properly written in capital letters and was chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use the code in the postal address. The basic format consists of five decimal numerical digits. An extended ZIP+4 code, introduced in the 1980s, includes the five digits of the ZIP code, a hyphen, and four more digits that determine a more precise location than the ZIP code alone. The term ZIP code was originally registered as a servicemark (a type of trademark) by the U.S. Postal Service, but its registration has since expired.

ZIP codes designate only delivery points within the United States and its dependencies, as well as locations of its armed forces. There are no ZIP codes reserved for designating mail bound for foreign destinations (with the exception of U.S. military units stationed outside of the United States), and therefore, international outbound mail should not include a ZIP code in the delivery address. The last line of a foreign address must only show the name of the country of destination.

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