Receive a local area code
636
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Economic Overview
The 636 area code region features a diversified economy with strengths in healthcare, advanced manufacturing, retail, logistics, and technology. Major employers include BJC HealthCare, Mercy, Boeing, CitiMortgage, and leading school districts. The area benefits from a mix of corporate offices, small businesses, and distribution centers due to its proximity to St. Louis.
Geographical Overview
Area code 636 covers the western suburbs of St. Louis, primarily in St. Charles County, as well as parts of Jefferson and Franklin counties. Key cities include St. Charles, O’Fallon, Lake St. Louis, Wentzville, Wildwood, Ballwin, Chesterfield (western portions), and Arnold. The region includes both suburban developments and some rural communities.
Location Info
Area code 636 was created in 1999 from a split of 314 and covers St. Charles County, southern and western St. Louis County (outside the I-270 loop), most of Jefferson County, and portions of Franklin County. It borders area codes 314, 573, and 618 (Illinois). The region sits just west and southwest of downtown St. Louis, Missouri.
Population Demographics
The 636 area code region is predominantly suburban, with a population that is largely White, but growing in diversity. Residents tend to have above-average household incomes, high rates of home ownership, and strong educational attainment. The area is popular with families and commuters working in the greater St. Louis area.
Time Zone Info
Area code 636 is located entirely within the Central Time Zone (CT).
Other Area Code Details
The 636 region is known for its fast-growing suburbs, top-rated public schools, and recreational attractions such as the Katy Trail, Missouri River parks, and historic Main Street in St. Charles. Wentzville, one of the fastest-growing cities in Missouri, is located in this area code.
