Area code 720
Area code 720 serves Denver and nearby parts of Colorado, including Aurora, Lakewood and Boulder. It is on Mountain Time, which observes daylight saving time. 303 and 983 are overlays for the same area.
Area code 720 at a glance
Cities in 720
- Denver
- Aurora
- Lakewood
- Boulder
An area code shows where a number was first assigned. Mobile numbers keep their area code when people move, so the person you’re calling may be somewhere else.
When you can call a 720 number
Federal telemarketing rules under the TCPA allow sales calls between 8 AM and 9 PM in the called person’s local time. Here is that window for a 720 number, shown in your own time zone.
General information, not legal advice. Some states add rules for Sundays, holidays or the number of calls. See our calling hours guide.
| If you’re on | You can call 720 between |
|---|---|
| Eastern | 10:00 AM to 11:00 PM |
| Central | 9:00 AM to 10:00 PM |
| Mountain | 8:00 AM to 9:00 PM |
| Arizona | 7:00 AM to 8:00 PM |
| Pacific | 7:00 AM to 8:00 PM |
See the time in 720 without leaving your CRM
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Other area codes in Colorado
Questions about 720
What time zone is area code 720?
Area code 720 is on Mountain Time. It observes daylight saving time.
Where is area code 720?
Area code 720 is in Colorado. Its main city is Denver, and it also covers Aurora, Lakewood and Boulder.
What are the legal hours to call a 720 number?
Under the federal TCPA, sales calls are allowed from 8 AM to 9 PM in the called person’s local time. Personal and informational calls are not limited by these hours.
What area codes overlay 720?
303 and 983 cover the same area as 720, so numbers in the same town can have either code.