Format guide
Colorado address format (CO)
Addresses in Colorado use the USPS abbreviation CO. Write the street number and street name on the first line, then Denver, CO and a 5-digit ZIP on the last line. Apartment or suite numbers belong on their own line with Apt, Ste, or Unit.
Postal codes
Colorado ZIP codes are 5 digits and may include ZIP+4. Samples on this page stay in CO and use Denver as the default city so form tests can check state, city, and postal fields together.
Typical use cases
Use this Colorado generator for layout and validation tests only. Do not submit the sample to payments, identity checks, shipping, or tax systems.
How to use test data
In development you can use these samples to check field length, line breaks, international characters, and responsive layouts. For payment, identity, logistics, or compliance flows, use official sandbox data from your provider—do not submit these samples to live systems.