Area Code 307-233 located in CASPER, NATRONA, WY, more detail is as below. Place NPA (Numbering Plan Area) : 307 NXX (Local Number Prefix) : 233 City : CASPER County : NATRONA State : WY (Wyoming) NXX Use Type : Landline NXX Intro Version : 1999-07-22 FIPS (Federal Information Processing Standards) : 56025 LATA (Local Access Transport Area) : 654 Rate Center : CASPER ZIP Code Count : 8 ZIP Code Frequency : 89 ZIP Code : 82601 Other Information NPANXX : 307233 County Population : 0 Switch CLLI (Common Language Location Identifier) : CSPRWYMADS0 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 : QWEST CORPORATION OCN (Operating Company Number) : 9636 Coverage Area Name : CASPER Latitude : 42.8502 Longitude : -106.3229 ‹ previous : 307-233 next › : 307-234 Telephone Number List 307-233-0000 ~ 307-233-9999