What area code is 720?
Here's everything about it.
Instant lookup for the 720 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
720 at a glance
Summary
Cities & regions served by 720
Denver (overlay)6 communities on record for 720.
Where 720 sits on the map
Overlay: 983Coverage area
About the 720 region
720 covers Denver in Colorado, including Boulder, Longmont, Aurora, Golden and Limon. The code has been in service since 1998.
720 itself is an overlay: it shares its territory with 303 and was introduced when those codes ran low on new number combinations. New lines may receive either code, calls between them are local, and 10-digit dialing is required across the region.
Overlaid on 303; 2022: overlaid by 983.
Who called me from 720?
Community reports- Caller ID is trivially spoofed: an incoming call that displays 720 does not prove the caller is really in the 720 region or even in the United States.
- Avoid calling back unknown one-ring numbers — some premium-rate scams rely on curiosity callbacks.
- Never share verification codes, payment details, or remote access during an unsolicited call, even if the caller claims to be your bank or a government agency.
- When a 720 call pressures you to act immediately, hang up and contact the organization directly through its official number.
Be the first to add a community report for a 720 number below.
Frequently asked questions
FAQWhat area code is 720?+–
720 is a telephone area code serving Denver in Colorado, United States, in service since 1998.
Where is area code 720 located?+–
It covers Boulder, Longmont, Aurora, Golden and Limon in Colorado.
What cities are in area code 720?+–
Major communities on record include Boulder, Longmont, Aurora, Golden and Limon, among others. The code's territory spans the Denver region of Colorado.
What time zone is 720?+–
720 observes Mountain (MT), which is UTC−7 / −6 DST and follows daylight saving time.
When did area code 720 start?+–
720 entered service in 1998. Its history: overlaid on 303; 2022: overlaid by 983.
Why do calls to 720 require 10-digit dialing?+–
720 shares its territory with overlay code 983. Because both codes serve the same geographic area, the phone network needs all 10 digits to route a call, and calls between the codes are still local.
Is 720 a scam area code?+–
Scam and robocall traffic can use any North American code, 720 included — caller ID is easy to spoof, so the code alone does not tell you who is really calling. Check the community reports on this page before calling back an unknown 720 number, and report anything suspicious.
Can I get a 720 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 720 number regardless of where you physically live, although in an overlaid region you may be assigned 303 instead.