Area codes · +1
Area code 636
Area code 636 is centred on Missouri. We hold 3,797 allocated blocks for it across 46 rate centres, split 34% mobile, 51% landline and 15% VoIP.
The towns inside area code 636
Area code 636 is not a city code. It covers 46 separate rate centres — billing areas, each its own local calling zone. The largest of them are named in the table below.
That matters twice over. A call between two 636 numbers is not necessarily a local call, because they can sit in different rate centres. And a code this wide narrows a subscriber to a region rather than a town.
Missouri is split across 9 area codes — 573, 816, 314, 417, 636, 660 and others. By allocated blocks 636 is the 5th largest of them, holding 12% of the Missouri total.
Where 636 numbers are concentrated
NANPA truncates rate-centre names to ten characters and drops the spaces, which is why St Charles and Fsscrstlcy are shortened. Names are reproduced as recorded rather than expanded — the abbreviation is the key the block data is filed under.
| Rate centre | Blocks | Share of 636 |
|---|---|---|
| St Charles | 333 | 9% |
| Harvester | 320 | 8% |
| Chesterfld | 314 | 8% |
| Manchester | 201 | 5% |
| Ofallon | 197 | 5% |
| Fsscrstlcy | 159 | 4% |
| Maxville | 129 | 3% |
| Fenton | 128 | 3% |
| St Peters | 128 | 3% |
| Wentzville | 125 | 3% |
| Union | 119 | 3% |
| Washington | 114 | 3% |
| Valleypark | 107 | 3% |
| High Ridge | 103 | 3% |
| Troy | 102 | 3% |
| Warrenton | 98 | 3% |
| Cedar Hill | 80 | 2% |
| Imperial | 76 | 2% |
| De Soto | 65 | 2% |
| Pacific | 64 | 2% |
| Pond | 59 | 2% |
| Antonia | 57 | 2% |
| Eureka | 57 | 2% |
| Graysummit | 52 | 1% |
22 further rate centres in 636 hold fewer blocks than these.
Carriers holding the most 636 blocks
Onvoy644 blocks
Southwestern Bell466 blocks
AT&T Wireless454 blocks
T-Mobile USA, Inc.242 blocks
T-Mobile Usa, Inc.184 blocks
Verizon Wireless174 blocks
The largest holder, Onvoy, 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 636 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 636 number, or run a whole list through the free cleaner — neither uploads anything.
Common questions
Where is area code 636?
Area code 636 is centred on Missouri and spans 46 rate centres, so it covers a region rather than a town.
Is a 636 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 636 the split runs 34% mobile, 51% landline and 15% VoIP, so landline is the most likely single answer.
Which carriers hold 636 numbers?
The largest holders are Onvoy, Southwestern Bell, AT&T Wireless. That is the carrier the block was allocated to, which is not necessarily the network a given number sits on today.
How many 636 numbers are there?
The code holds 3,797 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 636 covers on the order of 3,797,000 possible numbers — most of which have never been issued to anyone.