Oregon Revised Statutes Public Organizations for Community Service § 267.205

(1) A district board may by ordinance classify and designate as a service area the territory within the district that is benefited by the mass transit system beyond the general benefit to all territory within the district. The board may by ordinance amend the boundaries of the service area to conform to changes in the mass transit system service.

(2) Subject to restrictions in the Oregon Constitution, any of the methods of financing authorized under ORS 267.300 may, in the discretion of the board, be imposed in the service area rather than in the entire district.