Area Code 720: Colorado, Colorado
720 is a telephone area code serving Colorado. It is part of the North American Numbering Plan and is dialed with the country code +1.
Numbers beginning with 720 are located in Colorado, United States (NANP region: Denver Metro).
How to Dial Area Code 720
| Calling from | What to dial |
|---|---|
| Anywhere in the US or Canada | 1 720 XXX-XXXX (10-digit dialing: 720 + 7-digit number) |
| Local call inside the same area code | 7-digit number in most areas; 10 digits where an overlay code is active |
| From the UK or Europe | 00 1 720 XXX XXXX |
| From Australia | 0011 1 720 XXX XXXX |
| From a mobile phone anywhere | +1 720 XXX XXXX |
Whatever country you are calling from, the + symbol replaces the exit code. Save the contact as +1 720 XXXXXXX and it will dial correctly from any phone in the world.
Time Zone for Area Code 720
Calls to a 720 number ring in the America/Denver time zone, standard offset UTC-07:00. Daylight saving time applies here, so the offset moves forward one hour from March to November.
Other Area Codes in Colorado
These codes also serve Colorado. Area codes are assigned by the North American Numbering Plan Administration (NANPA).
| Area Code | Cities / Coverage |
|---|---|
| 303 | Denver |
| 719 | Colorado Springs, Pueblo |
| 970 | Fort Collins, Grand Junction |
| 983 | Denver (overlay) |
See all 5 area codes in Colorado →
Frequently Asked Questions
Where is area code 720?
Area code 720 is in Colorado, United States. It covers Denver (overlay).
What time zone is area code 720 in?
Area code 720 rings in the America/Denver time zone (UTC-07:00 standard).
Do I need to dial 1 before area code 720?
Yes, for a long-distance call inside the US and Canada you dial 1 first, then 720, then the seven-digit number. The 1 is the North American long-distance trunk prefix — it is not the country code. From outside North America you dial your exit code then 1 then 720.
Is area code 720 toll-free?
No. 720 is a standard geographic area code, so normal long-distance rates apply unless your plan includes them. Toll-free NANP codes are 800, 833, 844, 855, 866, 877 and 888.