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That's right ZIP Code is an official trademark owned by the United States Postal Service. The ZIP in ZIP Code is an acronym that stands for Zone Improvement Plan, and that is why ZIP is capitalized.

The standard ZIP code notation used by the United States Postal service uses five digits to identify a delivery area. An example of a standard US ZIP code is 90210.

A ZIP Code is a postal code used by the United States Postal Service (USPS). Introduced on July 1, 1963, the basic format consisted of five digits. In 1983, an extended ZIP+4 code was introduced; it included the five digits of the ZIP Code, followed by a hyphen and four digits that designated a more specific location.

You are right that the United States Postal Service writes ZIP Code with a capital Cand ZIP in all caps. You're also right about us. Though CMOS doesn't specifically rule on how to capitalize the term, it has rendered it as zip code (all lowercase) since it first appeared in the Manual in 1982 (in the 13th ed.).

Do not place a comma between the state and the ZIP code. If the address comes in the middle of a sentence, place another comma after the address: My family has lived at 1714 North Harvey Street, Griffith, Indiana, for four years.

Since our caller works for the U.S. government, and ZIP codes are a government thing, I checked the US Printing Office style guide first. It recommends ZIP Code. Associated Press style is similar: ZIP codetwo words with ZIP in all capsbut it uses a lowercase C, and I was surprised it would deviate.

From AP Style: ZIP code or Zip Code or ZIP Code? Use all-caps ZIP for Zoning Improvement Plan, but always lowercase the word code. Run the five digits together without a comma, and do not put a comma between the state name and the ZIP code: New York, NY 10020.