Area code 636 serves the western suburbs of St. Louis, Missouri, including cities such as St. Charles, Chesterfield, and Washington. It was established in 1999 from a split of area code 314 to accommodate suburban growth. The region is known for a mix of residential communities, small businesses, and historical river towns along the Missouri River. Ten-digit dialing is required in many parts of Missouri due to overlay arrangements. 636 represents the continued expansion of the Greater St. Louis metro and its economic influence.
Locations for Area Code - 636
Browse all cities and areas that belong to this area code.
Ballwin
- State: MO
- Population: 30,577
- Latitude: 38.59505, Longitude: -90.54623
- Elevation: 192 m
Chesterfield
- State: MO
- Population: 47,864
- Latitude: 38.66311, Longitude: -90.57707
- Elevation: 144 m
O'Fallon
- State: MO
- Population: 85,040
- Latitude: 38.81061, Longitude: -90.69985
- Elevation: 165 m
Saint Charles
- State: MO
- Population: 65,794
- Latitude: 38.78394, Longitude: -90.48123
- Elevation: 147 m
Saint Peters
- State: MO
- Population: 52,575
- Latitude: 38.80033, Longitude: -90.62651
- Elevation: 134 m
Wildwood
- State: MO
- Population: 35,899
- Latitude: 38.58283, Longitude: -90.6629
- Elevation: 230 m
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