What State Has the Lowest Zip Code?


Quick Answer

As of 2014, the lowest ZIP Code in the United States is 00501, which doesn't belong to a specific city but is a unique code assigned to the Internal Revenue Service (IRS) office in Holtsville, New York. This code is only used by the IRS office and is not used by the citizens or businesses of Holtsville. Other low ZIP Codes include 01001 (Agawam, Massachusetts), 01002 (Amherst, Massachusetts) and 00601 (Adjuntas, Puerto Rico).

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What State Has the Lowest Zip Code?
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Full Answer

The number 0 is the lowest first digit of a possible ZIP Code in America; the states and areas with 0 assigned as the first digit of their code include areas of New England such as Connecticut, Massachusetts, Maine, New Hampshire and Vermont. Other areas, such as New Jersey, Puerto Rico, the U.S. Virgin Islands and the Army Post Office Europe also have ZIP Codes that start with 0. In general, ZIP Code numbers rise moving westward and from north to south; West Coast states including Oregon, Washington and California have ZIP codes that begin with the number 9, and Northern states such as Montana have lower codes than Southern states such as Texas. ZIP is an acronym for Zone Improvement Plan, and these codes have been part of the U.S. public mail service since 1963.

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