What Is the Abbreviation for Colorado?
The standard 2-letter abbreviation for Colorado is CO.
Colorado Abbreviation
CO is the standard abbreviation for Colorado. Colo. still appears in older print sources, but CO is the standard code used in addresses, forms, databases, and current style guides.
Colorado Abbreviation for Mailing and Forms
Use CO for Colorado in mailing addresses, shipping labels, official forms, and database entries.
In all of these contexts write CO in uppercase. The form CO. with a period is incorrect for postal use.
AP Style and Traditional Colorado Abbreviation
What Does CO Stand For?
Colorado's USPS abbreviation is CO.
USPS has used CO for Colorado since 1963. The older form Colo. still appears in some older publications, but CO is the standard for modern addresses and forms.
How to Write a Colorado Address
In a U.S. mailing address, write the city name, then CO in uppercase, then the five-digit ZIP Code. Never put a period after the abbreviation.
The same format applies in checkout forms, school worksheets, CRM systems, spreadsheets, shipping labels, and government databases — anywhere a two-letter state code is required.
Related Abbreviation Questions
These states share a first letter, region, or alphabetical position with Colorado and are commonly looked up alongside it.
FAQ
What is the abbreviation for Colorado?
The standard USPS abbreviation for Colorado is CO.
What is the postal abbreviation for Colorado?
CO is the two-letter postal abbreviation for Colorado. It is the form used in mailing addresses, shipping labels, forms, and databases.
How do you abbreviate Colorado?
Abbreviate Colorado as CO in current USPS, mailing, and database use.
What is the two-letter abbreviation for Colorado?
CO is the official two-letter abbreviation for Colorado.
What is the Colorado state code?
CO is the two-letter state code used for Colorado in mailing addresses, forms, spreadsheets, and databases.
Why is Colorado abbreviated CO?
Colorado's USPS abbreviation is CO.
What does CO stand for?
CO stands for Colorado in the USPS state abbreviation system.
What is the old abbreviation for Colorado?
Older editorial styles often wrote Colorado as Colo.. For mailing and database use, the modern standard is CO.
How do you write a Colorado mailing address?
Use the city name, then the two-letter postal code CO, then the ZIP Code. For example: Denver, CO 00000.
What state is CO?
CO is the postal abbreviation for Colorado, located in the West region. The capital is Denver.