Area Code 503-304 located in SALEM, MARION, OR, more detail is as below. Place NPA (Numbering Plan Area) : 503 NXX (Local Number Prefix) : 304 City : SALEM County : MARION State : OR (Oregon) NXX Use Type : Landline NXX Intro Version : 1995-07-04 FIPS (Federal Information Processing Standards) : 41047 LATA (Local Access Transport Area) : 672 Rate Center : SALEM ZIP Code Count : 1111 ZIP Code Frequency : 50 ZIP Code : 97305 Other Information NPANXX : 503304 Switch CLLI (Common Language Location Identifier) : SALMOR59DS0 MSA CBSA (Core Based Statistical Area) : Salem, OR MSA CBSA Code (Core Based Statistical Area) : 41420 Time Zone : Pacific (GMT -08:00) Observes Daylight Saving Time : Yes Company : QWEST CORPORATION OCN (Operating Company Number) : 9638 Coverage Area Name : SALEM Latitude : 44.9964 Longitude : -123.0157 ‹ previous : 503-304 next › : 503-305 Telephone Number List 503-304-0000 ~ 503-304-9999