Area Code 303-228 located in DENVER, DENVER, CO, more detail is as below. Place NPA (Numbering Plan Area) : 303 NXX (Local Number Prefix) : 228 City : DENVER County : DENVER State : CO (Colorado) NXX Use Type : Landline NXX Intro Version : 1998-01-25 FIPS (Federal Information Processing Standards) : 08031 LATA (Local Access Transport Area) : 656 Rate Center : DENVER ZIP Code Count : 1 ZIP Code Frequency : 4 ZIP Code : 80204 Other Information NPANXX : 303228 County Population : 0 Switch CLLI (Common Language Location Identifier) : DNVRCO26DS1 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 : ICG TELECOM GROUP - CO OCN (Operating Company Number) : 7801 Coverage Area Name : DENVER Latitude : 39.7467 Longitude : -104.9948 ‹ previous : 303-228 next › : 303-228 Telephone Number List 303-228-0000 ~ 303-228-9999