Area Code 303-290 located in LITTLETON, DOUGLAS, CO, more detail is as below. Place NPA (Numbering Plan Area) : 303 NXX (Local Number Prefix) : 290 City : LITTLETON County : DOUGLAS State : CO (Colorado) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 08035 LATA (Local Access Transport Area) : 656 Rate Center : DENVER ZIP Code Count : 31 ZIP Code Frequency : 3 ZIP Code : 80126 Other Information NPANXX : 303290 County Population : 0 Switch CLLI (Common Language Location Identifier) : DNVRCODCDS0 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 : QWEST CORPORATION OCN (Operating Company Number) : 9636 Coverage Area Name : DENVER Latitude : 39.5990 Longitude : -104.9024 ‹ previous : 303-290 next › : 303-290 Telephone Number List 303-290-0000 ~ 303-290-9999