Area codes · +1
Area code 983
Area code 983 covers Denver, Colorado. We hold 416 allocated blocks for it across 6 rate centres, split 45% mobile, 10% landline and 45% VoIP.
The other area codes laid over 983
Area code 983 does not have Denver to itself. 2 other codes — 303, 720 — 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 983 number and a 303 number from the same street can report different line types. Filtering Denver by area code needs all 3 of them.
983 is not confined to Denver itself: its blocks sit across 6 rate centres, named in the table below.
Colorado is split across 5 area codes — 720, 970, 719, 303, 983. By allocated blocks 983 is the 5th largest of them, holding 2% of the Colorado total.
Where 983 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 983 |
|---|---|---|
| Denver | 320 | 77% |
| Longmont | 71 | 17% |
| Fortlupton | 13 | 3% |
| Deckers | 5 | 1% |
| Strasburg | 4 | 1% |
| Roggen | 3 | 1% |
Carriers holding the most 983 blocks
Onvoy121 blocks
AT&T Wireless78 blocks
Verizon Wireless69 blocks
Bandwidth30 blocks
Wide Voice, Llc16 blocks
Teleport Communications America, Llc15 blocks
The largest holder, Onvoy, has 29% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 983 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 983 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 983?
Area code 983 covers Denver, Colorado. It is not the only code there: 303, 720 are overlays on the same rate centres, so a Denver, Colorado number can start with any of them.
Is a 983 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 983 the split runs 45% mobile, 10% landline and 45% VoIP, so mobile is the most likely single answer.
Which carriers hold 983 numbers?
The largest holders are Onvoy, AT&T Wireless, Verizon Wireless. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 983 numbers are there?
The code holds 416 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 983 covers on the order of 416,000 possible numbers — most of which have never been issued to anyone.