Area Code 720 Phone Number
for Your Business
Get a local 720 number for your business in Denver, CO. Cloud VoIP with SMS, an auto attendant (IVR), and more — starting at $30/ext/mo. No contracts.
What Is Area Code 720?
Area code 720 is a North American telephone area code serving Denver, Colorado and 1 other city in the region. It has been in service since June 1, 1998 and operates on Mountain Time. It is part of the 303/720/983 overlay complex. Businesses operating in the 720 area code region use local numbers to build trust with customers, improve answer rates, and establish a professional local presence.
With Zonitel, you can get a new 720 area code number or port your existing one with guided onboarding — no hardware required. Your team can make and receive calls from any device using the Zonitel mobile app or web portal.
Area Code 720 at a Glance
- Region
- Denver (overlay), Colorado
- In service
- Since June 1, 1998
- Time zone
- Mountain Time
- History
- Added on June 1, 1998 as an overlay of 303
- Telemarketing hours
- 8 a.m.–9 p.m. Mountain Time for residential numbers (TCPA, 47 CFR 64.1200(c)(1))
Cities Served by Area Code 720
Why Your Business Needs a 720 Local Number
A local number tells customers you're part of the community. People in Denver are more likely to pick up a call from a 720 number they recognize than from an unfamiliar out-of-area number.
Everything Included With Your 720 Number
Zonitel is not just a phone number — it's a complete cloud business phone system. Every plan includes:
Frequently Asked Questions About Area Code 720
What cities use area code 720?
Area code 720 serves the Denver (overlay) area of Colorado. Cities in the 720 region include Denver, CO; Boulder, CO.
Is area code 720 an overlay?
Yes. 720 is part of the 303/720/983 overlay, so new numbers in this region can come from any of those area codes, and local calls require 10-digit dialing.
What time zone is area code 720 in?
Area code 720 is in Mountain Time. Telemarketing calls to residential 720 numbers are limited to 8 a.m.–9 p.m. Mountain Time under the TCPA (47 CFR 64.1200(c)(1)).
Can I get a 720 number for my business without moving there?
Yes. With Zonitel's cloud VoIP, you can get a 720 area code number regardless of where your business is physically located. This lets you establish a local presence in Denver without a physical office.
Can I keep my existing 720 number and switch to Zonitel?
Yes. Number porting is free. Porting commonly takes 5–10 business days depending on your current carrier, and your old service stays active until the coordinated cutover.
How much does a 720 business phone number cost?
Zonitel plans start at $30/extension/month plus tax, with no setup fees and no contracts. Your 720 local number is included in the plan.
Get Your 720 Area Code Number Today
30-day free trial. No annual contract required. Guided onboarding.