The ZIP code is the system of postal codes used by the United States Postal Service (USPS) to define locations when distributing mail. The letters ZIP is an acronym for Zone Improvement Plan,[1] and this system was created so that the mail travels more efficiently, and therefore more quickly. The basic format consists of five numerical digits: a three-digit prefix indicating regional location, followed by two other numerals indicating a more local area. An extended ZIP + 4 code includes the five digits of the ZIP code, a hyphen, and four more digits that determine a more precise location within the ZIP code. The term ZIP Code was originally registered as a servicemark (a type of trademark) by the U.S. Postal Service but its registration has since expired.[2]

Michigan ZIP codesEdit

All Michigan ZIP codes begin with either 48- or 49-. The three digit prefixes are each assigned to a sectional center facility (SCF), the processing and distribution center for the USPS. There are eleven SCFs in Michigan.

SCF cite Prefixes serviced
Royal Oak 480, 483
Detroit 481–482
Flint 484–485
Saginaw 486–487
Lansing 488–489
Kalamazoo 490–491
Jackson 492
Grand Rapids 493–495
Traverse City 496
Gaylord 497
Iron Mountain 498–499

Additionally, ZIP code boundaries do not always follow geopolitical boundaries. A ZIP code may include portions of another community. For example, 48306 is assigned to Rochester, but only includes a small portion of the community. It serves much larger areas of Rochester Hills, Oakland Charter Township and Goodison. As a result, the USPS permits these communities to be used as alternative places when mailing items.[3]

See alsoEdit

ZIP code on Wikipedia

Notes and referencesEdit

  1. "ZIP Code," from International Paper Knowledge Center glossary
  2. Trademark status information, from United States Patent and Trademark Office
  3. ZIP code lookup
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