State · United States
Colorado postal codes
399 cities · 645 localities · 645 postal codes · state code CO
Area codes (5)
303719720970983
Area codes in use in this state, from NANPA central-office assignments.
Popular cities
- Denver
- Colorado Springs
- Aurora
- Littleton
- Fort Collins
- Pueblo
- Longmont
- Arvada
- Boulder
- Greeley
- Broomfield
- Englewood
All cities (399)
A22
B27
C43
- Cahone
- Calhan
- Campo
- Canon City
- Capulin
- Carbondale
- Carr
- Cascade
- Castle Rock
- Cedaredge
- Center
- Central City
- Chama
- Cheraw
- Cheyenne Wells
- Chromo
- Cimarron
- Clark
- Clifton
- Climax
- Coal Creek
- Coaldale
- Coalmont
- Collbran
- Colorado City
- Colorado Springs
- Commerce City
- Como
- Conejos
- Conifer
- Cope
- Cortez
- Cory
- Cotopaxi
- Cowdrey
- Craig
- Crawford
- Creede
- Crested Butte
- Crestone
- Cripple Creek
- Crook
- Crowley
D15
E17
F18
G23
H23
L27
M28
P26
R16
S30
U1
W23
Postal code index (645)
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Data generated on 2026-08-21 · Sources · Report an error.