Area Code 303-243 located in DENVER, DENVER, CO, more detail is as below. Place NPA (Numbering Plan Area) : 303 NXX (Local Number Prefix) : 243 City : DENVER County : DENVER State : CO (Colorado) NXX Use Type : Wireless NXX Intro Version : 1997-04-01 FIPS (Federal Information Processing Standards) : 08031 LATA (Local Access Transport Area) : 656 Rate Center : DENVER ZIP Code Count : 0 ZIP Code Frequency : Second most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 80204 Other Information NPANXX : 303243 County Population : 0 Switch CLLI (Common Language Location Identifier) : KIOWCOAF1MD MSA CBSA (Core Based Statistical Area) : Denver-Aurora, CO MSA CBSA Code (Core Based Statistical Area) : 19740 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : N.E. COLORADO CELLULAR, INC. OCN (Operating Company Number) : 6874 Coverage Area Name : DENVER Latitude : 39.7454 Longitude : -105.0512 ‹ previous : 303-242 next › : 303-243 Telephone Number List 303-243-0000 ~ 303-243-9999