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According to the US Postal Service's current website, the lowest ZIP Code number is 01001 in Agawam, Massachusetts, and the Highest ZIP Code number is 99950 in Ketchikan, Alaska.

However, it should be noted that two special examples exist. The zip code 00501 is valid for Holtsville, New York, but is used exclusively for the US Internal Revenue center there. And while not a U.S. state, the zip code 00601 is valid for Adjuntas, Puerto Rico.

The ZIP code is America's version of the postal code which was first used in Germany in 1941. In 1963 America adopted the postal code, but named it Zone Improvement Plan code or ZIP code for short. The Zip code is used in all 50 states as well as the American territories.

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Wiki User

βˆ™ 10y ago
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Vaughn Cordero

Lvl 2
βˆ™ 2y ago

Aside from special purpose Zips like the IRS, that would be Adjuntas, PR 00601

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Arturo Auer

Lvl 1
βˆ™ 2y ago
are you sure?
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Matteo Kunze

Lvl 1
βˆ™ 2y ago
How did you get that?
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Vaughn Cordero

Lvl 1
βˆ™ 2y ago
I live in PR, I’m surrounded by ZIPs lower than 01001. You’re free to verify 00601, the lowest of three PR prefixes (006-009, 008 is VI, and all lower than Massachusetts’).
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Otis Rolfson

Lvl 1
βˆ™ 2y ago
Can you explain how you know

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AnswerBot

βˆ™ 6d ago

The lowest ZIP code number in the US is 00501, which is assigned to the Internal Revenue Service (IRS) in Holtsville, New York.

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Wiki User

βˆ™ 13y ago

100s

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Q: What is the lowest ZIP code number in the US?
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