Area code
Area code 636 — Missouri
Missouri · in service since May 22, 1999
Area code 636 covers parts of Missouri. It was created from area code 314 on May 22, 1999 and no other code overlays it.
Local time in Missouri
Spam reports from Sep 23 – Oct 22, 2026
Average #266 of 461 codes
327 FTC complaints
Consumer reports, not verified by the FTC.
See the reports- Time zoneCentral Time
- Local calls7 digits
- Prefixes456 assigned
- Runs out~3Q 2075
- Unwanted call?Block & report
Spam call reports about 636 numbers
Complaints by week
Sep 11 – Oct 22, 2026Show as table
| Week starting | Complaints |
|---|---|
| Sep 7 (3 days) | 20 |
| Sep 14 | 62 |
| Sep 21 | 89 |
| Sep 28 | 79 |
| Oct 5 | 77 |
| Oct 12 | 68 |
| Oct 19 (4 days) | 52 |
Compared with all codes
- Robocalls
- 53%all codes 75%
- Callers with the same code
- 46%all codes 35%
- Rank by complaints
- #266of 461 · middle half
- FCC complaints, Oct 2025 – Sep 2026
- 564 about text messages
What the calls were about
Sep 11 – Oct 22, 2026
| Subject | Complaints | |
|---|---|---|
| Calls pretending to be government, businesses, or family and friends | 47 11% | |
| Reducing your debt (credit cards, mortgage, student loans) | 41 9% | |
| Dropped call or no message | 36 8% | |
| Medical & prescriptions | 32 7% | |
| Home improvement & cleaning | 18 4% | |
| Warranties & protection plans | 6 1% |
Where the people who complained live
Sep 11 – Oct 22, 2026
| State | Complaints | |
|---|---|---|
| Missouri | 293 66% | |
| Florida | 16 4% | |
| Ohio | 15 3% | |
| Illinois | 14 3% | |
| Georgia | 8 2% |
October 2026 (partial) report · most reported
Consumer reports, not verified by the FTC · source
Source: FTC Do Not Call complaints created Sep 11 – Oct 22, 2026. They are reported by consumers and are not verified by the FTC; caller ID can be spoofed (how we count).
Source: FCC Consumer Complaints data, unwanted calls filed Oct 1, 2025 – Sep 30, 2026, by caller ID; not verified by the FCC.
Area code 636 location and prefixes
| Exchange (NANPA) | Place | County | Prefixes |
|---|---|---|---|
| ST CHARLES | St. Charles | St. Charles County | 44 |
| CHESTERFLD | Chesterfield | St. Louis County | 36 |
| HARVESTER | — | — | 36 |
| MANCHESTER | Manchester | St. Louis County | 27 |
| OFALLON | O'Fallon | St. Charles County | 24 |
| FENTON | Fenton | St. Louis County | 16 |
| FSSCRSTLCY | — | — | 16 |
| ST PETERS | St. Peters | St. Charles County | 15 |
| VALLEYPARK | Valley Park | St. Louis County | 14 |
| WENTZVILLE | Wentzville | St. Charles County | 14 |
Plus 36 smaller exchange areas.
Source: NANPA CO codes of Oct 23, 2026; places: U.S. Census Bureau, matched by DialWhere (how).
Is 636 running out of numbers?
Previous forecast (October 2025): 2069, moved later by 6 years.
Forecast exhaust year by edition
Source: NANPA NRUF forecast, April 2026 edition.
Who holds 636 prefixes
The five largest of 33 original holders
As listed by NANPA, not today’s carrier.
| Holder (as listed) | Prefixes | |
|---|---|---|
| Southwestern Bell | 110 24% | |
| Brightspeed Of Missouri, LLC | 49 11% | |
| Onvoy, LLC | 36 8% | |
| T-Mobile USA, Inc. | 35 8% | |
| Level 3 Communications, LLC | 29 6% |
Source: NANPA CO codes of Oct 23, 2026.
Questions about area code 636
What area code is 636?
A Missouri area code, in service since May 22, 1999.
Where is 636 area code, and what time zone is it in?
Missouri; Central Time.
Why am I getting spam calls from 636?
327 FTC complaints from Sep 23 – Oct 22, 2026, most often about impostors (not verified by the FTC; caller ID can be spoofed).
Will 636 get a new area code?
NANPA forecasts exhaust in 3Q 2075; no relief planning listed.