Area code 720 covers Denver and surrounding areas in Colorado. It was activated in 1998 as an overlay of area code 303. Today it shares its territory with overlay codes 303 and 983.
| State | Colorado |
|---|---|
| Primary city | Denver |
| Cities also served | Denver, Aurora, Lakewood, Boulder, Arvada, Westminster, Longmont, Broomfield |
| Time zone | Mountain (UTC-7 / UTC-6 DST) |
| Year established | September 1, 1998 |
| Original 1947 NPA? | No |
| Parent code | 303 |
| Overlay codes | 303, 983 |
| Currently in use? | Yes, actively assigned |
| Ten-digit dialing required? | Yes |
Cities Served by Area Code 720
Area code 720 serves Denver–Boulder metropolitan area and surrounding Front Range suburbs, including Lakewood, Littleton, Longmont, Broomfield, Aurora, and Castle Rock, including the following cities and communities:
- Denver
- Aurora
- Lakewood
- Boulder
- Arvada
- Westminster
- Longmont
- Broomfield
Nearby area codes covering the same broader region include: 303, 719, 970, 983.
How to Get a 720 Phone Number
There are three ways to get a phone number with the 720 area code, each suited to a different need:
- Buy from a premium-number specialist. Companies that hold curated inventories of specific area codes can sell you a 720 number directly, often with a one-time fee and ownership transferred to you (no recurring carrier fees). This is the option for picking a specific memorable number, or for getting an area code that most carriers won’t let you request. Contact us about a 720 number.
- Sign up with a VoIP carrier. Voice-over-IP services (such as Google Voice, OpenPhone, Grasshopper, and many others) can typically provision a 720 number on request, especially for active overlay codes. You won’t usually get to pick the specific number, but you’ll get a working line in the area code. This is the cheapest option for anyone who doesn’t need a particular number.
- Port an existing 720 number. If you already have a 720 phone number with another carrier, you can transfer it (port it) to a new service provider while keeping the number. This works for landlines, cell phones, and VoIP services, though landlines outside of Colorado sometimes can’t accept inbound ports of 720 numbers due to 911 routing rules.
212areacode.com specializes in Manhattan 212 numbers and select premium area codes. We don’t currently maintain a 720 inventory, but we may be able to source a 720 number through our carrier relationships. Contact us with your requirements and we’ll let you know what’s available.
Ready to Get a 720 Number?
One-time fee. No monthly charges. Port to any carrier in 3–5 business days. NYC's most trusted source since 2009.
Browse 720 Numbers →Frequently Asked Questions
Is the 720 area code still in use?
Yes. 720 is actively assigned to new phone lines in Denver–Boulder metropolitan area and surrounding Front Range suburbs, including Lakewood, Littleton, Longmont, Broomfield, Aurora, and Castle Rock.
What is the difference between 720 and 303?
Today they share the same geographic territory in Colorado. New phone lines in the area may be assigned either code. The two codes work identically for calling, billing, and service.
What is the parent area code of 720?
Area code 720 is an overlay of 303. Both codes serve the same region of Colorado.
Can I get a 720 number if I don't live in Colorado?
Yes. Phone numbers are no longer tied to a physical address. With VoIP service or a number broker, you can hold a 720 number from anywhere in the world. The number routes to whatever device or carrier you specify.
Is 720 a scam area code?
No. 720 is a legitimate, active area code for Denver–Boulder metropolitan area and surrounding Front Range suburbs, including Lakewood, Littleton, Longmont, Broomfield, Aurora, and Castle Rock. Like any area code, scammers occasionally spoof 720 caller IDs, but the code itself is heavily used by real Colorado businesses, government offices, and residents.
Where is the 720 area code located?
Area code 720 is located in north-central Colorado, covering the Denver–Boulder metropolitan area and surrounding suburbs such as Aurora, Lakewood, Longmont, Broomfield, and Castle Rock.
Why does Denver have three area codes?
Rapid population and economic growth on Colorado’s Front Range exhausted available numbers under the original 303 code. Area code 720 was added as an overlay on September 1, 1998, and area code 983 was added as a second overlay on June 17, 2022, forming the current 303/720/983 overlay complex.
Do I need to dial 10 digits when calling a 720 number locally?
Yes. Because 720 shares its territory with overlays 303 and 983, ten-digit dialing is required for all calls made within the service area, including local calls.
Is 720 the same area as 303?
Yes. Area codes 720 and 303 cover exactly the same geographic region. Both can be assigned to numbers anywhere in the Denver–Boulder area; 983 also shares this territory since 2022.
