Area Code 503-288 located in PORTLAND, MULTNOMAH, OR, more detail is as below. Place NPA (Numbering Plan Area) : 503 NXX (Local Number Prefix) : 288 City : PORTLAND County : MULTNOMAH State : OR (Oregon) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 41051 LATA (Local Access Transport Area) : 672 Rate Center : PORTLAND ZIP Code Count : 1424 ZIP Code Frequency : 44 ZIP Code : 97212 Other Information NPANXX : 503288 Switch CLLI (Common Language Location Identifier) : PTLDOR12DS0 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 : QWEST CORPORATION OCN (Operating Company Number) : 9638 Coverage Area Name : PORTLAND Latitude : 45.5443 Longitude : -122.6402 ‹ previous : 503-288 next › : 503-289 Telephone Number List 503-288-0000 ~ 503-288-9999