Colorado ZIP Codes: Ranges, Prefixes and Major Cities
From 80001 to 81658, the ZIP codes of Colorado follow a clear pattern once you know what the first three digits mean. Below you will find the ranges, prefixes and city-by-city codes for the Centennial State.
ZIP code range and prefixes
Every Colorado ZIP code starts with one of 17 three-digit prefixes. Each prefix points to a sectional center facility, the processing plant that sorts mail for a group of nearby post offices.
- 800
- 801
- 802
- 803
- 804
- 805
- 806
- 807
- 808
- 809
- 810
- 811
- 812
- 813
- 814
- 815
- 816
Types of ZIP codes in Colorado
| Type | Count | What it covers |
|---|---|---|
| Standard | 443 | Street delivery areas |
| PO Box | 157 | Post office boxes only |
| Unique | 41 | A single high-volume organization |
ZIP codes for major Colorado cities
| City | County | Standard ZIPs | Range |
|---|---|---|---|
| Denver | Denver County | 45 | 80202–80299 |
| Colorado Springs | El Paso County | 31 | 80902–80951 |
| Aurora | Arapahoe County | 11 | 80010–80045 |
| Littleton | Douglas County | 10 | 80120–80130 |
| Pueblo | Pueblo County | 7 | 81001–81008 |
| Grand Junction | Mesa County | 6 | 81501–81507 |
| Arvada | Jefferson County | 5 | 80002–80007 |
| Boulder | Boulder County | 5 | 80301–80305 |
| Fort Collins | Larimer County | 5 | 80521–80528 |
| Englewood | Arapahoe County | 4 | 80110–80113 |
| Brighton | Adams County | 3 | 80601–80603 |
| Broomfield | Broomfield County | 3 | 80020–80023 |
| Castle Rock | Douglas County | 3 | 80104–80109 |
| Longmont | Boulder County | 3 | 80501–80504 |
| Dinosaur | Moffat County | 2 | 81610–81633 |
Denver is the state capital. Larger cities have many ZIP codes because each code follows mail delivery routes, not city limits.
Sample addresses
Thomas Moore
1720 Walnut Pl
Grand Junction, CO 81507
Thomas Hill
1162 Washington Rd
Aurora, CO 80016
Wei King
2025 Franklin Ave
Boulder, CO 80303
These examples use real city and ZIP pairs with invented street lines, so they are safe for testing and documentation.
Tips for working with these ZIP codes
- Store ZIP codes as text, not numbers, so the format stays consistent across states with leading zeros.
- All of Colorado is in the Mountain time zone, which keeps scheduling logic simple.
- A quick sanity check: a valid CO ZIP code begins with one of the prefixes listed above.
- City names in addresses are post office names. A suburb may share a ZIP code and city name with a nearby larger town.
Create realistic Colorado addresses for testing, with real cities, counties and ZIP codes.
Generate Colorado addresses