Area Code 314-271 located in MARYLAND HEIGHTS, SAINT LOUIS, MO, more detail is as below. Place NPA (Numbering Plan Area) : 314 NXX (Local Number Prefix) : 271 City : MARYLAND HEIGHTS County : SAINT LOUIS State : MO (Missouri) NXX Use Type : Landline NXX Intro Version : 2004-12-13 FIPS (Federal Information Processing Standards) : 29189 LATA (Local Access Transport Area) : 520 Rate Center : LADUE ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 63043 Other Information NPANXX : 314271 County Population : 0 Switch CLLI (Common Language Location Identifier) : MRHGMOGYDS0 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 : XO MISSOURI, INC. OCN (Operating Company Number) : 4774 Coverage Area Name : SAINT LOUIS Latitude : 38.7034 Longitude : -90.4189 ‹ previous : 314-271 next › : 314-272 Telephone Number List 314-271-0000 ~ 314-271-9999