Area Code 636-221 located in WASHINGTON, FRANKLIN, MO, more detail is as below. Place NPA (Numbering Plan Area) : 636 NXX (Local Number Prefix) : 221 City : WASHINGTON County : FRANKLIN State : MO (Missouri) NXX Use Type : Landline NXX Intro Version : 2002-10-25 FIPS (Federal Information Processing Standards) : 29071 LATA (Local Access Transport Area) : 520 Rate Center : WASHINGTON ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 63090 Other Information NPANXX : 636221 Switch CLLI (Common Language Location Identifier) : WASHMOBERS0 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 : SOUTHWESTERN BELL OCN (Operating Company Number) : 9533 Coverage Area Name : WASHINGTON Latitude : 38.5632 Longitude : -91.0334 ‹ previous : 636-220 next › : 636-222 Telephone Number List 636-221-0000 ~ 636-221-9999