Area Code 509-997 located in WINTHROP, OKANOGAN, WA, more detail is as below. Place NPA (Numbering Plan Area) : 509 NXX (Local Number Prefix) : 997 City : WINTHROP County : OKANOGAN State : WA (Washington) NXX Use Type : Landline NXX Intro Version : 1994-02-04 FIPS (Federal Information Processing Standards) : 53047 LATA (Local Access Transport Area) : 676 Rate Center : TWISP ZIP Code Count : 28 ZIP Code Frequency : 2 ZIP Code : 98862 Other Information NPANXX : 509997 Switch CLLI (Common Language Location Identifier) : TWISWAXADS0 Time Zone : Pacific (GMT -08:00) Observes Daylight Saving Time : Yes Company : CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK OCN (Operating Company Number) : 2408 Coverage Area Name : TWISP Latitude : 48.3650 Longitude : -120.1473 ‹ previous : 509-997 next › : 509-997 Telephone Number List 509-997-0000 ~ 509-997-9999