Area Code 307-252 located in ROCK SPRINGS, SWEETWATER, WY, more detail is as below. Place NPA (Numbering Plan Area) : 307 NXX (Local Number Prefix) : 252 City : ROCK SPRINGS County : SWEETWATER State : WY (Wyoming) NXX Use Type : Wireless NXX Intro Version : 2001-06-30 FIPS (Federal Information Processing Standards) : 56037 LATA (Local Access Transport Area) : 654 Rate Center : ROCK SPG ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 82901 Other Information NPANXX : 307252 County Population : 0 Switch CLLI (Common Language Location Identifier) : RCSPWY08AMD MSA CBSA (Core Based Statistical Area) : Rock Springs, WY MSA CBSA Code (Core Based Statistical Area) : 40540 Time Zone : Mountain (GMT -07:00) Observes Daylight Saving Time : Yes Company : UINTAH BASIN ELECTRONIC TELECOMMUNICATIONS OCN (Operating Company Number) : 1772 Coverage Area Name : ROCK SPRINGS Latitude : 41.5911 Longitude : -109.2131 ‹ previous : 307-251 next › : 307-253 Telephone Number List 307-252-0000 ~ 307-252-9999