Area Code 303-276 located in DENVER, DENVER, CO, more detail is as below. Place NPA (Numbering Plan Area) : 303 NXX (Local Number Prefix) : 276 City : DENVER County : DENVER State : CO (Colorado) NXX Use Type : Landline 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 : 303276 County Population : 0 Switch CLLI (Common Language Location Identifier) : ENWDCOMBDS0 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 : CONVERGENT COMMUNICATIONS, INC. - CO OCN (Operating Company Number) : 8287 Coverage Area Name : DENVER Latitude : 39.7454 Longitude : -105.0512 ‹ previous : 303-275 next › : 303-276 Telephone Number List 303-276-0000 ~ 303-276-9999