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Welcome to our Colorado ZIP Code database, featuring 664 ZIP Codes, 426 cities, 64 counties, and over 615,818 ZIP+4 Codes. Each 9-digit ZIP Code corresponds to one or more addresses within the Colorado.
Additionally, this site offers several address-related tools, including address validation, full ZIP Code search, and random address generator.
Random Address Generator
US Address Validation
Full ZIP Code Search
ZIP Code Radius Search
Counties in Colorado
ZIP Code
How to Address a U.S. Envelope?
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First, you need to fill in the recipient's mailing information in the center of the envelope. The first line is the recipient's name, the second line is the street address with a detailed house number, and the last line is the city, state abbr, and ZIP Code.
Second, write the sender's information on the left top corner of the envelope. If your mail cannot be delivered, it will return to the sender's address.
Finally, don't forget to stick the stamp on the right top corner. Otherwise, the letter will not go into the delivery process.
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For more explanation, please read the official document: USA.pdf (English)
