Area code 636 is a telephonearea code inNorth American Numbering Plan (NANP) for the east-central part of theU.S. state ofMissouri, comprising mainly the western suburbs ofSt. Louis. It includes parts ofChesterfield andFenton inSt. Louis County, and all ofSt. Charles,Jefferson, andWarren counties, all ofFranklin County with the exception ofSullivan, as well as the towns ofHigh Hill andJonesburg inMontgomery County and the southern portion ofLincoln County. It was created in 1999 in anarea code split fromarea code 314, which was one of theoriginal North American area codes of 1947.
When theAmerican Telephone and Telegraph Company (AT&T) created a universal North American telephone numbering plan forOperator Toll Dialing in 1947, Missouri was divided into two numbering plan areas (NPAs), which received the area codes 314 and816. Area code 314 identified the eastern part of the state, from the northeast corner of the state at the Illinois border along a southwestern line nearColumbia andJefferson City to the center of the state, and continuing southeast into the east side of theWest Plains area to the Arkansas state line. The largest city of the area code wasSt. Louis on the Mississippi river in the east.
By 1995, the telephone subscriber base experience substantial growth, threatening the exhaustion of the numbering pool.[1] Relief planning entailed the division of the numbering plan area to create a new area code, 573, for most areas outside of the St. Louis metropolitan area, which would retained area code 314. The area code split became effective at day end of January 7, 1996, with a permissive dialing period commencing until July 7, 1996, during which the new numbering plan area could be dialed with both area codes.
Although area code splits were intended as long-term solutions, within only two years, 314 was close to exhaustion once again due to the proliferation of cell phones, fax machines and pagers in St. Louis. As a result, 314 was reduced to include only the exchanges of Chestnut, Jefferson, Prospect, Flanders, Forest, Mission, Melrose, Webster Groves,Parkview, Evergreen, Riverview, Ferguson, Overland, Ladue, Kirkwood, Sappington, Mehlville,Oakville, Creve Coeur, Bridgeton, Hazelwood, Florissant, and Spanish Lake in the core of the St. Louis area.[2] All other exchanges were reassigned to the new area code 636, effective May 22, 1999, with the permissive dialing period ending on February 26, 2000.
Major cities:
| North:573,618,314 | ||
| West:573 | area code 636 | East:618,314 |
| South:573,314 | ||
| Illinois area codes:217/447,309/861,312,630/331,618/730,708/464,773,815/779,847/224,872 | ||