Area Code 636-203 located in FENTON, SAINT LOUIS, MO, more detail is as below. Place NPA (Numbering Plan Area) : 636 NXX (Local Number Prefix) : 203 City : FENTON County : SAINT LOUIS State : MO (Missouri) NXX Use Type : Landline NXX Intro Version : 2000-08-20 FIPS (Federal Information Processing Standards) : 29189 LATA (Local Access Transport Area) : 520 Rate Center : FENTON ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 63026 Other Information NPANXX : 636203 Switch CLLI (Common Language Location Identifier) : STLTMOBODS1 MSA CBSA (Core Based Statistical Area) : St. Louis, MO-IL MSA CBSA Code (Core Based Statistical Area) : 41180 Time Zone : Central (GMT -06:00) Observes Daylight Saving Time : Yes Company : MCI WORLDCOM COMMUNICATIONS, INC - MO OCN (Operating Company Number) : 7432 Coverage Area Name : FENTON Latitude : 38.5131 Longitude : -90.4329 ‹ previous : 636-200 next › : 636-205 Telephone Number List 636-203-0000 ~ 636-203-9999