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What are Long Island ZIP Codes?Long Island Zip Codes. What ZIP Codes are in Nassau County?ZIP Codes in Nassau County NY. 11550.. 11758.. 11590.. 11003.. 11520.. 11756.. 11580.. 11040.. What does the 4 digits after a ZIP code mean?So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.
How many ZIP Codes are there in Nassau County NY?The U.S. Postal Service has organized Nassau County into 111 different five-digit ZIP Codes served by 63 different post offices.
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