🇺🇸 720 area code
Area code 720 covers Denver, Aurora, Littleton and Boulder and the surrounding area in Colorado. It shares that territory with 303 and 983, so the same neighbourhood can have numbers in any of them. Enter a 720 number below for a free check before you call back.
- Location: Denver, Colorado
- Time zone: Mountain (UTC−7)
- In service since June 1, 1998
查询号码
首次查询即可得到有效性、运营商、线路类型和地区。
Area code 720 at a glance
Cities in area code 720
- Denver
- Aurora
- Littleton
- Boulder
- Highlands Ranch
- Parker
- Brighton
- Broomfield
- Castle Rock
- Longmont
Is a 720 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so a 720 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing a 720 number to people in Colorado because a local-looking call is more likely to be answered. If a 720 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 720
720 entered service on June 1, 1998, as an overlay on 303, which had run short of numbers.
It is part of the 303/720/983 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
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常见问题
Area code 720 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 720?
Area code 720 is in Colorado, United States. It covers Denver, Aurora, Littleton, Boulder, Highlands Ranch and Parker.
What time zone is area code 720?
720 is in the Mountain (UTC−7) time zone, and observes daylight saving time.
What area codes overlay 720?
303 and 983 serve the same area as 720. Numbers in all of them are local to one another.
When did area code 720 start?
720 entered service on June 1, 1998, created from 303.
How do I find out who called me from 720?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 720?
If you live in or near Colorado, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 720 callers who will not leave a message are best looked up before you call back.