Area Code 503-320 located in SANDY, CLACKAMAS, OR, more detail is as below. Place NPA (Numbering Plan Area) : 503 NXX (Local Number Prefix) : 320 City : SANDY County : CLACKAMAS State : OR (Oregon) NXX Use Type : Wireless NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 41005 LATA (Local Access Transport Area) : 672 Rate Center : PORTLAND ZIP Code Count : 1 ZIP Code Frequency : 20 ZIP Code : 97055 Other Information NPANXX : 503320 Switch CLLI (Common Language Location Identifier) : PTLDORQSCM1 MSA CBSA (Core Based Statistical Area) : Portland-Vancouver-Hillsboro, OR-WA MSA CBSA Code (Core Based Statistical Area) : 38900 Time Zone : Pacific (GMT -08:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR OCN (Operating Company Number) : 5820 Coverage Area Name : PORTLAND Latitude : 45.5869 Longitude : -122.7537 ‹ previous : 503-320 next › : 503-320 Telephone Number List 503-320-0000 ~ 503-320-9999