Area code 636

Area code 636 serves east-central Missouri, mainly the metro area of St. Louis excluding the city of St. Louis and most of St. Louis County, and also parts of St. Clair. Area code 636 includes parts of the community of Chesterfield, Fenton, and all of Washington, Union, De Soto, Troy, St. Charles, Jefferson, and Warren counties. Area code 314, now assigned to St. Louis and some suburbs, formerly extended to Washington and St. Francois counties.

Area code 636

Area code 636 serves east-central Missouri, mainly the metro area of St. Louis excluding the city of St. Louis and most of St. Louis County, and also parts of St. Clair. Area code 636 includes parts of the community of Chesterfield, Fenton, and all of Washington, Union, De Soto, Troy, St. Charles, Jefferson, and Warren counties. Area code 314, now assigned to St. Louis and some suburbs, formerly extended to Washington and St. Francois counties.