Area Code 503-366 located in COLUMBIA CITY, COLUMBIA, OR, more detail is as below. Place NPA (Numbering Plan Area) : 503 NXX (Local Number Prefix) : 366 City : COLUMBIA CITY County : COLUMBIA State : OR (Oregon) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 41009 LATA (Local Access Transport Area) : 672 Rate Center : ST HELENS ZIP Code Count : 139 ZIP Code Frequency : 6 ZIP Code : 97018 Other Information NPANXX : 503366 Switch CLLI (Common Language Location Identifier) : STHNOR40DS1 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 : ST HELENS Latitude : 45.8581 Longitude : -122.8113 ‹ previous : 503-366 next › : 503-366 Telephone Number List 503-366-0000 ~ 503-366-9999