Area codes · +1
Area code 313
Area code 313 covers Detroit. We hold 5,581 allocated blocks for it across 6 rate centres, split 53% mobile, 38% landline and 10% VoIP.
How far area code 313 reaches
Area code 313 covers 6 rate centres, so two 313 numbers are not always a local call to each other.
A rate centre is a billing boundary rather than a postal one, which is why an area code can span several and a single city can contain many. It is also why the code alone cannot place a subscriber beyond a rough region.
Michigan is split across 12 area codes — 313, 248, 734, 989, 517, 586 and others. By allocated blocks 313 is the largest of them, holding 11% of the Michigan total.
Where 313 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 313 |
|---|---|---|
| Detroit | 1,825 | 33% |
| Detroit | 1,171 | 21% |
| Detroit | 1,050 | 19% |
| Detroit | 589 | 11% |
| Detroit | 531 | 10% |
| Detroit | 400 | 7% |
Carriers holding the most 313 blocks
Omnipoint Communications Midwest Operations, Llc955 blocks
T-Mobile USA, Inc.861 blocks
Michigan Bell Tel Co573 blocks
AT&T Wireless536 blocks
Onvoy452 blocks
Bandwidth409 blocks
The largest holder, Omnipoint Communications Midwest Operations, Llc, has 17% of the code.
These are original allocations. A number keeps its digits and its block when its subscriber moves network, so a ported 313 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 313 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 313?
Area code 313 covers Detroit, spanning 6 rate centres.
Is a 313 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 313 the split runs 53% mobile, 38% landline and 10% VoIP, so mobile is the most likely single answer.
Which carriers hold 313 numbers?
The largest holders are Omnipoint Communications Midwest Operations, Llc, T-Mobile USA, Inc., Michigan Bell Tel Co. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 313 numbers are there?
The code holds 5,581 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 313 covers on the order of 5,581,000 possible numbers — most of which have never been issued to anyone.