Area Code 720 at a Glance
| Area code | 720 |
| Region | Colorado |
| Country | United States |
| Primary timezone | America/Denver |
| Dialing format | +1 (720) NXX-XXXX |
Cities and Places Using Area Code 720
Based on prefix-level carrier data, area code 720 covers places including:
- Denver, CO
- Aurora, CO
- Littleton, CO
- Boulder, CO
- Parker, CO
- Highlands Ranch, CO
- Castle Rock, CO
- Longmont, CO
- Brighton, CO
- Broomfield, CO
Frequently Asked Questions
Where is area code 720?
Area code 720 serves Colorado, United States.
Who is calling me from area code 720?
A call from area code 720 most likely originates from Colorado, but caller ID can be spoofed. If an unknown caller asks for personal or payment information, hang up and call the organization back on its official number.
How do I dial a 720 number?
Within North America: dial 1-720 followed by the 7-digit number. From abroad: your international prefix (like 00 or +), then 1 720 and the number.