Area Code 503-278 located in PORTLAND, MULTNOMAH, OR, more detail is as below. Place NPA (Numbering Plan Area) : 503 NXX (Local Number Prefix) : 278 City : PORTLAND County : MULTNOMAH State : OR (Oregon) NXX Use Type : Wireless NXX Intro Version : 8/5/2008 FIPS (Federal Information Processing Standards) : 41051 LATA (Local Access Transport Area) : 672 Rate Center : PORTLAND ZIP Code Count : 0 ZIP Code Frequency : 0 ZIP Code : 97217 Other Information NPANXX : 503278 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 : 503-277 next › : 503-279 Telephone Number List 503-278-0000 ~ 503-278-9999