Area Code 307-277 located in CASPER, NATRONA, WY, more detail is as below. Place NPA (Numbering Plan Area) : 307 NXX (Local Number Prefix) : 277 City : CASPER County : NATRONA State : WY (Wyoming) NXX Use Type : Wireless NXX Intro Version : 2004-01-27 FIPS (Federal Information Processing Standards) : 56025 LATA (Local Access Transport Area) : 654 Rate Center : CASPER ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 82609 Other Information NPANXX : 307277 County Population : 0 Switch CLLI (Common Language Location Identifier) : CHYNWY202MD MSA CBSA (Core Based Statistical Area) : Casper, WY MSA CBSA Code (Core Based Statistical Area) : 16220 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WY OCN (Operating Company Number) : 6566 Coverage Area Name : CASPER Latitude : 42.8413 Longitude : -106.3263 ‹ previous : 307-277 next › : 307-278 Telephone Number List 307-277-0000 ~ 307-277-9999