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Washington, Missouri Area Code Information |
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Washington, MO Area Code is 636 |
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Washington, MO is currently using one area code which is area code 636. Area code 636 was created from a split of area
code 314 and put into service on May 22, 1999. In addition to Washington, MO area code 636 serves the larger communities of Ballwin, Chesterfield, Manchester, O'Fallon, St. Charles, St. Peters and Wildwood,
along with many smaller communities in east central Missouri. Washington, MO does not utilize any area code overlays. |
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Missouri Area Codes |
314, 417, 573, 636, 660, 816 |
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