The list below includes the cities that the US Post Office accepts for ZIP code 21240. The preferred city may not be the city in which the ZIP is located. The city for 21240 is usually the name of the main post office. When mailing your package or letter, always include the preferred or acceptable cities. Using any city in the list of unacceptable cities may result in delays.
ZIP code 21240 is located in northern Maryland and covers an extremely small land area compared to other ZIP codes in the United States.
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