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AREA CODE · COLORADO

Area code 720

Area code 720 covers Denver, Colorado. Map, time zone, overlays, carriers, the full list of prefixes and how to dial it.

State: Colorado Major City: Denver Mountain Time (MT) Overlay: 303/720/983
01 / WHERE IT IS

Where is area code 720?

Area code 720 is assigned to Denver and the surrounding region in Colorado. Calls to numbers that start with 720 are routed to this area.

Area code 720 shares its territory with 303, 983. Because it is an overlay, local calls require dialing all 10 digits.

Counties covered

Denver CountyBoulder CountyWeld County

Line types

  • Mobile 39.19%
  • Landline 60.81%
02 / MAP

Area code 720 on the map

The shaded area joins the code’s numbering centers; the marker shows its main city.

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© OpenStreetMap contributors

03 / LOCAL TIME

Current time in Denver

This area code is in the Mountain Time (MT) time zone.

Local timeDenver, CO--:--:--

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America/DenverLive
04 / HOW TO DIAL

How to call Denver

WITHIN THE US720 XXX XXXX

Always 10 digits — landline, mobile or VoIP. Local, long distance or a different state: the format is always the same. You do not need to dial the 1 first.

FROM ABROAD+1 720 XXX XXXX

Exit codes: 00 Europe/Mexico · 011 Canada · 010 Japan · + universal

WHATSAPP / IMESSAGE+1 720 XXX XXXX

Always save the number in international format so messaging apps recognize it correctly:

Call typeTraditional landlineMobile / VoIP
Local (same area code)10 digits10 digits
US long distance1 + 10 digits10 digits
Emergency911911
🌐Universal+1 720 555 0123
🇪🇸🇲🇽Spain / Mexico00 1 720 555 0123
🇦🇺Australia0011 1 720 555 0123
🇯🇵Japan010 1 720 555 0123
HAVE THE FULL NUMBER?

Learn more about that number.

Check the line type and the carrier the number block was originally assigned to.

10 digits to see the carrier and line type of the number

05 / CARRIERS

Carriers in area code 720

Share of the number blocks by carrier and line type.

Landline

Lumen Technologies
36%
Bandwidth
11%
Sinch
11%
Verizon Business
11%
AT&T
8%
Others
23%

Mobile

T-MOBILE USA
43%
AT&T Mobility
30%
Verizon Wireless
24%
Sinch
2%
COMMNET WIRELESS
1%
Others
1%

Carrier shown is the original assignment of each number block and may differ today because of number portability.

06 / PREFIXES

Complete list of prefixes for area code 720

786 number blocks (NXX) assigned in this area code.

PrefixTypeCityCarrier
(720) 200 Landline Denver Lumen TechnologiesQWEST CORPORATION
(720) 201 Mobile Denver AT&T MobilityNEW CINGULAR WIRELESS PCS, LLC
(720) 202 Mobile Denver Verizon WirelessCELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO
(720) 203 Mobile Denver T-MOBILE USAT-MOBILE USA, INC.
(720) 204 Landline Longmont Lumen TechnologiesLEVEL 3 COMMUNICATIONS, LLC - CO
(720) 205 Mobile Denver T-MOBILE USAT-MOBILE USA, INC.
(720) 206 Landline Denver Verizon BusinessMCIMETRO ACCESS TRANSMISSION SERVICES LLC
(720) 207 Landline Denver Verizon BusinessMCIMETRO ACCESS TRANSMISSION SERVICES LLC
(720) 208 Landline Denver Verizon BusinessMCIMETRO ACCESS TRANSMISSION SERVICES LLC
(720) 209 Mobile Denver T-MOBILE USAT-MOBILE USA, INC.

Showing 10 of 786 prefixes

07 / FAQ

Frequently asked questions about area code 720

Where is area code 720 used?
Area code 720 serves Denver and the surrounding area in Colorado, including Denver County, Boulder County, Weld County.
What city is area code 720 from?
The main city of area code 720 is Denver, CO.
What time zone is area code 720 in?
Area code 720 is in the Mountain Time (MT) time zone (America/Denver).
Is 720 an overlay area code?
Yes. It shares its territory with 303, 983. In an overlay, every call requires dialing all 10 digits.
How do I call a number with area code 720 from the United States?
Dial the 10 digits: 720 + 7-digit number. For some long-distance calls from a landline you may need to add a 1 first.
How do I call a 720 number from another country?
Dial your country's exit code (or +), then 1, then 720 and the seven-digit number. From a mobile you can use +1 720 XXX XXXX.
Which carriers use area code 720?
Most landline blocks belong to Lumen Technologies and most mobile blocks to T-MOBILE USA. The carrier shown is the original assignment and may differ today because of number portability.
Is area code 720 for landlines, mobiles or both?
Both. About 60.81% of the number blocks are landline, 39.19% mobile.
How do I save a 720 number in WhatsApp or my phone?
Save it in international format: +1 720 XXX XXXX. That way WhatsApp, iMessage and Telegram recognize it from any country.
Is it safe to answer calls from area code 720?
The area code only shows the region a number was assigned to; it does not tell you who is calling. Scammers can fake any area code, so do not share personal or banking information with unknown callers, and let unknown numbers go to voicemail.
KEEP EXPLORING

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Other area codes in Colorado

303 · Denver719 · Colorado Springs-Main970 · Fort Collins983 · Denver

View all Colorado area codes →