Area code 636 – Missouri
636 has served Missouri since 1999, split from 314. 435 of its 786 number blocks are allocated (55%). AT&T is the largest holder with 36.3% of blocks, ahead of Brightspeed at 11.3%. Spam complaints are comparatively rare: 367 in the 33 days to 30 October 2026, 265th of the 422 codes with five or more complaints.
- State
- Missouri
- In service since
- 1999
- Time zone
- Central
- Shares area with
- No overlay
Who holds 636 number blocks
Share of the 435 assigned NXX blocks (55.3% of the 786 possible), across 31 carriers. This is share of number blocks, not of subscribers.
- AT&T36.3%
- Brightspeed11.3%
- Verizon11%
- T-Mobile8.7%
- Onvoy8.3%
- Lumen7.1%
- Windstream5.7%
- Charter4.4%
- Other CLEC / VoIP4.1%
- Peerless0.9%
- Bandwidth0.7%
- Spok0.5%
- Dish0.5%
- Telnyx0.2%
- American Messaging0.2%
Spam complaints naming 636
FTC Do Not Call complaints where the caller ID was a 636 number, 28 Sep – 30 Oct 2026 (33 days). Caller IDs on spam calls are frequently spoofed, so these are complaints about the code, not calls proven to originate in it.
Rate centers in 636
NANPA allocates number blocks to rate centers and records their names abbreviated to ten characters, so these are NANPA's codes rather than place names – CHAMPAURBN is Champaign-Urbana, NWYRCYZN01 is a New York City zone. We show them unchanged instead of guessing at the full names. Showing the largest 5 of 46.
Timeline
- 1999 636 goes into service, split from or overlaid on 314.
More about 636
Separate pages for the questions that need their own answer: what time it is there, what the complaint data says, who holds the number blocks, and how the code compares with the one it shares its area with.
Frequently asked about 636
What state is area code 636?
Missouri.
Is a call from 636 a scam?
Not by itself. 636 drew 367 FTC complaints in the 33 days to 30 October 2026, 265th of 422 ranked codes – mid-pack or lower. Spam callers spoof caller IDs, so the only useful check is the full number.
Which carrier owns 636 numbers?
AT&T holds the largest share of assigned number blocks at 36.3%. The rest is spread across 3 other carriers. This is share of number blocks, not of subscribers – people keep their numbers when they switch carriers.
Do I need to dial 10 digits in 636?
No. NANPA records 636 as 7-digit dialing for local calls.
Sources and verification
- NANPA – NPA Database (npa_report.csv), file date 11/01/2026, retrieved Nov 1, 2026
- NANPA – CO Code Assignment Records, All States (utilized), file updated 11/01/2026, retrieved Nov 1, 2026
- FTC – Do Not Call Reported Calls Data, 25 daily files 28 Sep – 30 Oct 2026, retrieved Nov 1, 2026
NANPA dialing note for this code: “7D”. Reviewed by the data desk. Spotted an error? Request a correction.