Boulder, Colorado
Area code 720
- State
- Colorado
- Region
- Mountain West
- Time zone
- MT
- Type
- Geographic
Got a missed call from 720?
Our directory lists 720 for Boulder, Colorado, but an area code alone cannot establish who is calling. Scammers can fake caller ID to match the first six digits of the number they are dialing, a trick called neighbor spoofing, so a familiar-looking code proves nothing about who is really calling.
If you were not expecting the call, let it go to voicemail. Verify the caller through a trusted contact method before returning the call, and never share personal details with an unverified caller.
Worth knowing: an area code no longer tells you where someone is. Mobile numbers keep their original code when people move, so a 720 number may belong to someone who left Colorado years ago.
Frequently asked questions about 720
Where is area code 720?
Our directory lists area code 720 for Boulder, Colorado. The listed city is a reference location, not a complete coverage map. A phone number's area code does not establish the caller's current location.
What time zone is area code 720 in?
This directory uses Mountain Time (MT) for Colorado. This is state-level guidance; confirm the recipient's local time before calling.
Is area code 720 a scam?
An area code alone cannot tell you whether a call is genuine. Caller ID can be spoofed, including numbers that appear local. Let unexpected calls go to voicemail and verify the caller independently before sharing personal information.
Is area code 720 toll-free?
The directory lists 720 as a geographic area code, not a toll-free code. US toll-free codes include 800, 833, 844, 855, 866, 877, and 888. Your carrier and calling plan determine any charges.