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The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits. The first five digits represent the 5-digit ZIP Code; the sixth and seventh digits (the first two after the hyphen) identify an area known as a sector; the eighth and ninth digits identify a smaller area known as a segment.

Use all-caps for ZIP and always lowercase the word code. Use the uppercase abbreviated two-letter U.S. Post Office standard for states and territories. Don't put a comma between the state name and the ZIP code.

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 code??two words with ?ZIP? in all caps?but it uses a lowercase C, and I was surprised it would deviate.

If you are writing an address with a zip code in content, style guides often agree on including a comma between the city and state (e.g., Chicago, IL) in the city-state-zip code line. When we are writing zip codes for the U.S. mail, the postal service prefers that punctuation not be used.

The most complete ZIP Code is a nine-digit number consisting of five digits, a hyphen, and four digits, which the USPS describes by its trademark ZIP+4. The correct format for a numeric ZIP+4 code is five digits, a hyphen, and four digits.

The U.S. Postal Service uses ZIP Code. It also includes a trademark symbol (ZIP Code?) even though available information suggests the mark expired in 1997. The Associated Press Stylebook advises using ZIP code.

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 code??two words with ?ZIP? in all caps?but it uses a lowercase C, and I was surprised it would deviate.

The 2020?2022 edition of the Associated Press Stylebook says to write ?all-caps ZIP for Zone Improvement Plan, but always lowercase the word code.? But don't despair. We are filing your question with the many other suggestions from our readers for future editions of CMOS.

Yes, when using a ZIP+4 ZIP Code, the number must consist of five digits, a hyphen (or dash), and four digits. Improperly labeled mailpieces may progress slower through the mail system and may be returned to sender if the United States Postal Service® is unable to deliver the item.