How to Write a Colorado Address (With Examples)

Address basics  |   |  2 min read

A correctly written Colorado address helps mail and packages arrive on time, and it keeps your databases clean. This guide covers the format with real city and ZIP examples.

The standard format

RECIPIENT NAME STREET NUMBER AND NAME, UNIT CITY, CO ZIP CODE

The state is always written as CO, two capital letters with no periods. USPS prefers the city, state and ZIP on the same final line.

Example: Denver

Thomas Moore 1862 Hill St Denver, CO 80202

Example with an apartment in Denver

Susan Moore 353 Liberty Ct Apt 4 Denver, CO 80219

Example with a PO Box

Sarah Baker PO Box 2124 Denver, CO 80219

PO Boxes often have their own ZIP code, separate from street addresses in the same town. Check the ZIP with the post office that holds the box.

Common mistakes

  • Mixing up CO with CT (Connecticut). These codes look similar and cause misrouted mail.
  • Writing the full state name or an old abbreviation instead of CO.
  • Putting the apartment number on a line below the street address.
  • Using a ZIP code from a neighboring city. One city can have many codes, but each street belongs to a specific one.

Counties and local details

Colorado is divided into 64 counties. The county does not appear in a mailing address, but it matters for sales tax, elections and some shipping rules, so many business systems store it separately.

Create realistic Colorado addresses for testing, with real cities, counties and ZIP codes.

Generate Colorado addresses