Area codes · +1
Area code 720
Area code 720 covers Denver, Colorado. We hold 7,293 allocated blocks for it across 12 rate centres, split 48% mobile, 35% landline and 17% VoIP.
The other area codes laid over 720
Area code 720 does not have Denver to itself. 2 other codes — 303, 983 — serve the same rate centres, laid over the same ground rather than dividing it. That is an overlay: a new code added when the old one ran out of numbers, covering the same streets. Two neighbours can hold different area codes, so the code says roughly when a number was issued rather than where it sits.
Each holds its own blocks and its own carrier mix, so a 720 number and a 303 number from the same street can report different line types. Filtering Denver by area code needs all 3 of them.
720 is not confined to Denver itself: its blocks sit across 12 rate centres, named in the table below.
Colorado is split across 5 area codes — 720, 970, 719, 303, 983. By allocated blocks 720 is the largest of them, holding 34% of the Colorado total.
Where 720 numbers are concentrated
Rate-centre names are reproduced as NANPA records them. The agency truncates them to ten characters, so longer names appear shortened elsewhere on this site.
| Rate centre | Blocks | Share of 720 |
|---|---|---|
| Denver | 6,158 | 84% |
| Longmont | 409 | 6% |
| Fortlupton | 154 | 2% |
| Georgetown | 118 | 2% |
| Deckers | 110 | 2% |
| Allnspklyn | 108 | 1% |
| Keenesburg | 99 | 1% |
| Hudson | 85 | 1% |
| Deer Trail | 27 | 0% |
| Strasburg | 11 | 0% |
| Bennett | 4 | 0% |
| Byers | 2 | 0% |
Carriers holding the most 720 blocks
Verizon Wireless1,125 blocks
Onvoy842 blocks
T-Mobile Usa, Inc.740 blocks
AT&T Wireless700 blocks
Bandwidth674 blocks
T-Mobile USA, Inc.658 blocks
The largest holder, Verizon Wireless, has 15% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 720 number still reports the carrier it started with. Closing that gap needs a live query against the routing database. How line type is derived.
Check a single 720 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 720?
Area code 720 covers Denver, Colorado. It is not the only code there: 303, 983 are overlays on the same rate centres, so a Denver, Colorado number can start with any of them.
Is a 720 number a mobile or a landline?
It can be either, and the digits do not say which. North American mobile and landline numbers share the same ranges, so the answer comes from the carrier holding the block. In 720 the split runs 48% mobile, 35% landline and 17% VoIP, so mobile is the most likely single answer.
Which carriers hold 720 numbers?
The largest holders are Verizon Wireless, Onvoy, T-Mobile Usa, Inc.. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 720 numbers are there?
The code holds 7,293 allocated blocks in our copy of the numbering plan. A block is 1,000 or 10,000 consecutive numbers depending on how deeply it has been pooled, so 720 covers on the order of 7,293,000 possible numbers — most of which have never been issued to anyone.