What Is the Smallest ZIP Code in the United States?

Discover the smallest ZIP code in the US, 00501, used by the IRS in Holtsville, NY for specialized mail delivery.

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The smallest ZIP code in the United States is 00501, assigned to the Internal Revenue Service (IRS) in Holtsville, New York. ZIP codes are primarily used for efficient mail delivery, and specialized codes like 00501 help streamline the IRS's operations. While interesting, this ZIP code is not typically used for residential or commercial addresses.

FAQs & Answers

  1. What is ZIP code 00501 used for? ZIP code 00501 is assigned to the Internal Revenue Service in Holtsville, New York, and is used primarily for IRS mail processing rather than residential or commercial addresses.
  2. Are there other specialized ZIP codes like 00501? Yes, there are several specialized ZIP codes in the US assigned to government agencies, businesses, or PO boxes to streamline mail delivery.
  3. How are ZIP codes assigned in the United States? ZIP codes are assigned by the USPS to facilitate efficient mail delivery, generally based on geographic regions but sometimes designated for specific organizations.

Watch More

For more intriguing facts about ZIP codes and their unique uses, explore our content on USPS ZIP code history and specialized postal codes across the United States.

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