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A ZIP Code is a 5-digit number that specifies an individual destination post office or mail delivery area. ZIP Codes determine the destination of letters for final sorting and delivery.

For example, 40202 is in Louisville, 50309 in Des Moines, 60601 in Chicago, 63101 in St. Louis, 77036 in Houston, 80202 in Denver, 94111 in San Francisco, 98101 in Seattle, and 99950 in Ketchikan, Alaska (the highest ZIP Code).

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.

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.

Look Up a ZIP Code ™ By Address. Enter a corporate or residential street address, city, and state to see a specific ZIP Code™. Find by Address. By City and State. Enter city and state to see all the ZIP Codes™ for that city. Find by City & State. Cities by ZIP Code™ Enter a ZIP Code™ to see the cities it covers.

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.

Addresses (ZIP code present) USPS abbreviations are used for both the street address and state, and there is no punctuation in the lines for the street address or city, state and ZIP code. Write to Paul and Mary Moore, 1313 E Main St, Portage MI 49024-2001.

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.