Area Code 509-378 located in KENNEWICK, BENTON, WA, more detail is as below. Place NPA (Numbering Plan Area) : 509 NXX (Local Number Prefix) : 378 City : KENNEWICK County : BENTON State : WA (Washington) NXX Use Type : Wireless NXX Intro Version : 2005-03-27 FIPS (Federal Information Processing Standards) : 53005 LATA (Local Access Transport Area) : 676 Rate Center : KENNEWICK ZIP Code Count : 0 ZIP Code Frequency : Most frequently occurring ZIP Code, although percentage is unknown. ZIP Code : 99336 Other Information NPANXX : 509378 Switch CLLI (Common Language Location Identifier) : SPKNWAQRCM1 MSA CBSA (Core Based Statistical Area) : Kennewick-Richland-Pasco, WA MSA CBSA Code (Core Based Statistical Area) : 28420 Time Zone : Pacific (GMT -08:00) Observes Daylight Saving Time : Yes Company : CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA OCN (Operating Company Number) : 5812 Coverage Area Name : KENNEWICK Latitude : 46.2084 Longitude : -119.1216 ‹ previous : 509-378 next › : 509-379 Telephone Number List 509-378-0000 ~ 509-378-9999