636 Area Code
St. Louis suburbs, Missouri
Area code 636 is located in St. Louis suburbs, Missouri. It covers Florissant, Chesterfield, and surrounding areas in the Central time zone (UTC-6). Administered by NANPA.
Where is area code 636?
Area code 636 is located in St. Louis suburbs, Missouri. It covers Florissant, Chesterfield, and surrounding areas in the Central time zone (UTC-6).
Cities Covered by Area Code 636
Area code 636 primarily serves the St. Louis suburbs area of Missouri. The exact coverage includes Florissant, Chesterfield, and O'Fallon, along with surrounding communities and suburbs.
Time Zone
Central Time — UTC-6
Area code 636 operates in the Central Time Zone. When calling 636 numbers from a different time zone, be sure to account for the time difference to reach people during business hours.
About Area Code 636
Area code 636 was introduced in 1999 as a geographic area code serving St. Louis suburbs, Missouri. It remains the primary area code for this region. Area codes are administered by NANPA (North American Numbering Plan Administration), the organization responsible for managing phone number resources in the US and Canada.