The 509-491 exchange is serviced by the following companies within the KENNEWICK ratecenter.
TELEPORT COMMUNICATIONS AMERICA, LLC - WA
Call are routed trough OCN 7146 and CLLI - YAKMWAWECMD (Common Language Location Identifier Code) and Point of Interface (POI) switch which is located in YAKIMA.
Who's number is 509-491 Numbers?