MISSOURI · AREA CODE GUIDE
636 area code location: O'Fallon and Saint Charles, Missouri
- Local date and time
- Central Time
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Download the 636 area code map
A printable area code 636 location map, with time zone and state. Use the PNG image in a document or slide; the SVG stays sharp at any size.
636 area code at a glance
- Country and calling code
- United States (+1)
- In service since
- Parent code
- 314
- New code planned
- No, as of 22 September 2026
An area code does not show where a caller is now.
Sources: NANPA area code listing, NANPA places by area code. Checked .
Time zone
- Central Time
- Standard time UTC−06:00
- Daylight saving time UTC−05:00
Where 636 reaches
636 numbers are issued across 46 communities. These are telephone exchange areas, which follow the phone network rather than city limits, so a place can sit just outside the boundary of the town it is named for.
- O'Fallon
- Saint Charles
- Saint Peters
- Wentzville
- Chesterfield
- Manchester
- Washington
- Troy
- Union
- Eureka
- Warrenton
- Pacific
- Valley Park
- De Soto
- Wright City
- Saint Clair
- Moscow Mills
- Fenton
- Hillsboro
- Winfield
- Marthasville
- Foristell
- Jonesburg
- Hawk Point
- New Melle
21 more communities
- Portage des Sioux
- Old Monroe
- Augusta
- High Hill
- Foley
- Truxton
- Antonia
- Cedar Hill
- Dardenne
- Defiance
- Festus Crystal City
- Gray Summit
- Harvester
- Herculaneum-Pevely
- High Ridge
- Holstein
- Imperial
- Maxville
- Orchard Farm
- Pond
- Ware
Notable places in 636
| Place | Where | What it is |
|---|---|---|
| Mid America Adventure | 3.0 km from Eureka | Amusement park |
| Spirit of St. Louis Airport | 6.3 km from Chesterfield | Airport |
| World Wide Technology Soccer Park | 2.3 km from Fenton | Stadium |
| St. Charles County Smartt Airport | 5.8 km from Orchard Farm | Airport |
| Butterfly House, Missouri Botanical Garden | 3.2 km from Chesterfield | Zoo |
| Lindenwood University | 1.5 km from Saint Charles | University, 10,951 12-month enrollment (2023–24) |
| St. Charles Airport | 5.7 km from Orchard Farm | Airport |
| Hidden Valley Ski Area | 4.2 km from Eureka | Resort |
| Logan University | 4.5 km from Chesterfield | College, 2,128 12-month enrollment (2023–24) |
| Midwest University | 3.5 km from Wentzville | University |
Questions about 636
Where is the 636 area code?
636 is in Missouri. Its numbers are issued in O'Fallon, Saint Charles, Saint Peters, and 43 other communities.
What time zone is area code 636 in?
636 is in Central Time. Daylight saving time is observed.
Business phone numbers in area code 636, answered by an AI agent
A local number for O'Fallon, Saint Charles, and Saint Peters, Missouri, with an AI receptionist that takes caller details, answers the questions you give it, and books appointments. Numbers depend on what carriers have left.