Area Code 307-205 located in CASPER, NATRONA, WY, more detail is as below. Place NPA (Numbering Plan Area) : 307 NXX (Local Number Prefix) : 205 City : CASPER County : NATRONA State : WY (Wyoming) FIPS (Federal Information Processing Standards) : 56025 Rate Center : CASPER ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 82601 Other Information NPANXX : 307205 County Population : 0 Switch CLLI (Common Language Location Identifier) : CSPRWYDHDS0 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 Latitude : None Longitude : None ‹ previous : 307-204 next › : 307-206 Telephone Number List 307-205-0000 ~ 307-205-9999