Oregon Revised Statutes Oregon Vehicle Code § 805.047

(1) Upon request of any county, the Department of Transportation may issue registration plates or other evidence of registration from any regular series rather than from any specially designed government series for a vehicle owned or operated by the county. The registration period for a vehicle described under this section shall be the same as the regular registration period for the type of vehicle registered. The fee for registration or renewal of registration of a vehicle under this section shall be the fee established under ORS 803.420 (1) or (9).

(2) Any vehicle registered under this section and not exempted under ORS 815.300 must meet the requirements for certification of compliance with pollution control under ORS 815.310.