Area Code 303-351 located in KEENESBURG, WELD, CO, more detail is as below. Place NPA (Numbering Plan Area) : 303 NXX (Local Number Prefix) : 351 City : KEENESBURG County : WELD State : CO (Colorado) NXX Use Type : Landline NXX Intro Version : 11/8/2006 FIPS (Federal Information Processing Standards) : 08123 LATA (Local Access Transport Area) : 656 Rate Center : DECKERS ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 80643 Other Information NPANXX : 303351 County Population : 0 Switch CLLI (Common Language Location Identifier) : HNSNCO02PS0 MSA CBSA (Core Based Statistical Area) : Greeley, CO MSA CBSA Code (Core Based Statistical Area) : 24540 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : 360NETWORKS (USA) INC. - CO OCN (Operating Company Number) : 764D Coverage Area Name : KEENESBURG Latitude : 40.1066 Longitude : -104.5146 ‹ previous : 303-350 next › : 303-352 Telephone Number List 303-351-0000 ~ 303-351-9999