Denver, Colorado
720 Area Code
Connect with Denver and the Front Range through a 720 area code number. Sharing geography with the iconic 303, the 720 code delivers equal local credibility and higher availability for Colorado businesses.
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About 720 Area Code
Area code 720 serves Denver and the Front Range region of Colorado. Introduced on July 1, 1998 as an overlay to the original 303 area code, 720 covers identical geography including Denver, Aurora, Boulder, Lakewood, Thornton, Arvada, Westminster, Centennial and surrounding communities across six counties. Area code 983 was added in 2022 as a third overlay. The code supports local voice and SMS-enabled numbers used by aerospace companies, technology startups, healthcare providers, financial services and diverse businesses throughout Colorado's capital metro area.
Denver's economy thrives on aerospace and defense, technology and software, healthcare systems, energy and natural resources, financial services, and outdoor tourism. Local businesses use 720 numbers for customer support, appointment scheduling, sales outreach and community engagement. While some longtime residents maintain strong attachment to the original 303 code, 720 carries full local legitimacy and functions identically. A 720 number signals Denver presence just as effectively as 303, delivering higher answer rates compared to toll-free or out-of-state numbers.
FoneSwift displays real-time 720 availability with Voice, SMS and MMS capabilities clearly marked. Because 720 shares geography with 303 and 983 in an overlay, all three codes serve identical areas. The 720 code often has better availability than the highly sought-after 303. If your preferred 720 number isn't available, 303 or 983 numbers provide the same geographic coverage. Nearby codes like 719 and 970 serve other Colorado regions if you need additional inventory.
When publishing a 720 number, use both local format (720) 555-1234 and international format +1 720 555 1234. Register A2P profiles for business messaging to maintain carrier compliance. Many Colorado organizations port existing numbers to preserve customer relationships while gaining cloud telephony features like IVR, AI voice agents and analytics. Check our porting guide or contact support to transfer your current 720, 303 or 983 number to FoneSwift.
| Country | United States |
| State | Colorado |
| Area code | 720 |
| Primary cities | Denver, Aurora, Boulder, Lakewood |
| Counties served | Adams, Arapahoe, Boulder, Broomfield, Clear Creek, Denver, Douglas, Elbert, Gilpin, Jefferson, Park, Weld |
| Timezone | America/Denver (MST) |
| Created | July 1, 1998 |
| International Format | +1 720 XXX XXXX |
| Local Format | (720) XXX-XXXX |
10-digit dialing required for all calls within and to the 303/720/983 overlay region. Register A2P messaging (10DLC) for business SMS to meet US carrier compliance requirements.
Area code 720 uses Mountain Standard Time (MST, UTC-7) and observes Daylight Saving Time, shifting to Mountain Daylight Time (MDT, UTC-6) from March to November each year.
Local 720, 303 and 983 numbers deliver higher answer rates and local credibility in Denver. All three codes serve identical geography. The 720 code often has better availability than the highly sought-after 303.
Quick Facts about 720 Area Code
Interesting tidbits about this area code 720
First Colorado overlay
Area code 720 became Colorado's first overlay when it was added to the Denver metro area in 1998. This avoided forcing half the region to change numbers, which would have disrupted businesses and residents.
Equal status confirmed
Despite initial resistance from 303 loyalists, 720 has achieved full acceptance as a legitimate Denver area code. Both codes are considered equally local by residents, businesses and government agencies.
Tech startup favorite
Many Denver tech startups and newer businesses prefer 720 numbers because they signal modern operations while maintaining local credibility. The code has become associated with Denver's growing innovation economy.
Mobile-friendly launch
Area code 720 launched during the mobile phone boom of the late 1990s. Many of the earliest 720 numbers were assigned to cellular carriers, making it the first Denver code strongly associated with mobile usage.
Triple overlay complete
With the addition of 983 in 2022, the Denver metro area now operates with three area codes serving identical geography: 303 (original), 720 (1998) and 983 (2022). All require 10-digit dialing.
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How Does Local 720 Phone Numbers Work?
A local business number is a structured telephone identifier that tells networks where to route calls and messages. When you use a 720 number in Denver and Colorado, the digits signal the international gateway, the geographic region, the local exchange and the specific subscriber, so calls reach the right destination quickly and reliably.
The typical parts of a United States local number are:
- Country code (+1): identifies United States for international routing.
- Area code (720): directs the call to the Denver / Colorado region.
- Central office / exchange (eg. 555): narrows the call to a local switching area or rate center.
- Subscriber number (eg. 1234): the unique line assigned to a person, extension, or device.
Example formats:
| International Format (E.164) | +1 720 555 1234 |
| Local Format (National) | (720) 555-1234 |
Quick Dialing Guide
The correct formats to reach 720 numbers locally and globally.
From Landlines
Standard United States FormatUse for domestic long-distance calls within United States.
From Mobile
E.164 InternationalThe universal format. Works on any mobile device, anywhere.
International
From abroadDialing from outside United States (exit code 00 varies by country).
With FoneSwift, your 720 number can be instantly configured through our intuitive dashboard. Connect it to call forwarding rules, AI voice agents, IVR menus, or route calls directly to any device. Enable voice, SMS, and MMS capabilities right from your account, no technical setup required. Your number becomes active immediately after purchase, and you can update routing, business hours, and integrations anytime.
For businesses, local numbers offer clear benefits: higher answer rates, stronger local recognition, and better performance for local campaigns and customer trust. Typical business features include call forwarding, call recording, auto-attendants, voicemail-to-email, and multi-device ringing.
Important operational notes:
- SMS & A2P: If you plan to send application-to-person messages from a 720 number, register your traffic where required and follow carrier rules (10DLC/A2P) to avoid deliverability or throughput issues.
- Number Porting: Bring your existing 720number to FoneSwift seamlessly. Our team handles the entire porting process, simply submit your number details and we'll coordinate with your current provider. Porting typically completes within 5-10 business days, and you'll receive updates at each step. There's no service interruption during the transfer.
- Display & formatting: Always publish numbers in both local and E.164 formats so international and mobile users can easily dial.
Ready to get started? Browse available 720 numbers in the phone numbers section above, you'll see real-time availability and can filter by features like voice, SMS, and MMS. Once you find your perfect number, purchase it in seconds and start making calls immediately. Our team is here to help you choose the right setup for your business needs, whether you're setting up AI receptionists, call forwarding, or SMS campaigns. Start your 14-day free trial today, no credit card required.
How to Get a 720 Phone Number
Buying a local 720 phone number using FoneSwift is easy and takes just a few minutes. Follow these simple steps to get your local 720 phone number and start connecting with customers in United States today.
Create a new account on FoneSwift or sign in to your existing account to get started.
Once logged in, you'll be taken to your FoneSwift dashboard where you can manage all your phone numbers and settings.
Click on Settings in the sidebar, then go to "My Numbers" and click the "Add a Number" button.
Choose United States as your country from the dropdown menu.
Select Local as the type of number, then choose the 720 area code from the available options.
Click the "Search" button to see all available phone numbers with the selected area code.
Browse through the available numbers, select one that fits your needs, click "Buy Number", and confirm your purchase.
Your number is now active! Start making and receiving calls from the FoneSwift Dialer immediately.
You can configure your number to handle calls, forward calls, or even create an AI voice agent to handle the calls for you.
Businesses Using 720 Phone Numbers
Denver and the Front Range host technology, aerospace, healthcare, financial services and tourism industries. Local 720 numbers support customer engagement and signal authentic Colorado presence.
Technology & software
Tech companies, software developers, SaaS platforms and digital startups use 720 numbers for customer support, sales outreach and technical assistance. Denver ranks fifth nationally in tech worker concentration.
Aerospace & defense
Lockheed Martin, Ball Aerospace, Boeing and space technology firms use local numbers for government contracts, supplier coordination, mission support and recruitment. Colorado hosts major aerospace operations.
Healthcare & wellness
Hospitals, clinics, telehealth providers and wellness centers rely on 720 numbers for appointment scheduling, patient communications, prescription reminders and care coordination across the Front Range.
Financial services & fintech
Banks, investment firms, insurance companies and fintech startups leverage 720 numbers for customer service, advisory calls and account management. Denver ranks among top U.S. financial centers.
Energy & cleantech
Oil and gas companies, renewable energy firms and cleantech startups use local numbers for field operations, client communications and supplier coordination. Denver serves as a major energy industry hub.
Tourism & outdoor recreation
Hotels, ski resorts, restaurants, breweries and tour operators use 720 numbers for reservations, guest services and visitor support. Tourism drives major economic activity throughout the Denver region.
Why Choose 720 Local Phone Number for Your Business?
Discover the advantages of having a local phone number that builds trust, increases engagement, and drives results.
Powerful Features for Your 720 Local Phone Number
Get the most out of your localphone number with FoneSwift's enterprise-grade features designed to help your business communicate more effectively.
Nearby Area Codes
Explore other area codes in the same region to expand your local presence.
Frequently Asked Questions
What areas does the 720 area code cover?
Is 720 the same as 303?
Will customers recognize 720 as a Denver number?
Can I get Voice and SMS on 720 numbers?
Do I need to dial 10 digits for local calls in Denver?
How do I purchase a 720 phone number?
Can I port my existing 720 number to FoneSwift?
Where can I find official 720 area code information?
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