US States Zip Directory 2026

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Currently We have more than 42735 Records of US States Zip Codes from all over the United States!

Maryland Zip Codes



Maryland Maryland is a U.S. state located in the Mid Atlantic region of the United States, bordering Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware to its east. Maryland was the seventh state to ratify the United States Constitution, and has three occasionally used nicknames: the Old Line State, the Free State, and the Chesapeake Bay State.

Maryland is the 9th smallest state by area, but the 19th most populous and the 5th most densely populated of the 50 United States. The state s most populated city is Baltimore and its capital Annapolis. It was named after Queen Henrietta Maria. Of the 50 states Maryland has the highest median household income, making it the wealthiest state in the nation.

State Zip Code City County Area Codes
MD 20588 Dhs Howard County 410
MD 20601 Waldorf Charles County 227, 240, 301
MD 20602 Waldorf Charles County 227, 240, 301
MD 20603 Waldorf Charles County 227, 240, 301
MD 20604 Waldorf Charles County 240
MD 20606 Abell St. Mary's County 227, 240, 301
MD 20607 Accokeek Prince George's County 227, 240, 301
MD 20608 Aquasco Prince George's County 227, 240, 301, 410, 443, 667
MD 20609 Avenue St. Mary's County 227, 240, 301
MD 20610 Barstow Calvert County 410
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Map of Maryland


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.