This is a list of sister cities of cities and towns in the United States state of Colorado. Sister cities, known in Europe as twin towns, are cities which partner with each other to promote human contact and cultural links, although this partnering is not limited to cities and often includes counties, regions, states and other sub-national entities.

Many Colorado jurisdictions work with foreign cities through Sister Cities International, an organization whose goal is to "promote peace through mutual respect, understanding, and cooperation."^[1]

A

Arvada^[2]

Aspen^[3]

Aurora^[4]

B

Beaver Creek^[5]

• Lech, Austria

Boulder^[6]

Brighton^[7]

• Ziębice, Poland

Broomfield^[8]

• Ueda, Japan

C

Cañon City^[9]

Colorado Springs^[10]

Commerce City^[11]

• Nanning, China

D

Denver^[12]

Durango^[13][14]

E

Estes Park^[15]

• Monteverde, Costa Rica

Evans^[16]

• Ashby-de-la-Zouch, England, United Kingdom

G

Grand Junction^[17]

• El Espino (Jucuarán), El Salvador

Greeley^[18]

• Moriya, Japan

Gunnison^[19]

• Majkhali, India

L

Lakewood^[20]

• Sutherland, Australia

Lamar^[21]

• Pilsting, Germany

Littleton^[22]

• Bega Valley, Australia

Longmont^[23]

M

Mancos^[24]

• Feins, France

P

Pueblo^[25]

S

Steamboat Springs^[26]

V

Vail^[27]

• St. Moritz, Switzerland