RCW 36.57.110: Boundaries of unincorporated transportation benefit areas.

The legislative body of any county is hereby authorized to create and define the boundaries of unincorporated transportation benefit areas within the unincorporated areas of the county, following school district or election precinct lines, as far as practicable. Such areas shall include only those portions of the unincorporated area of the county which could reasonably assume to benefit from the provision of public transportation services.