Oregon Revised Statutes Education and Culture § 330.005

(a) “School district” includes a common school district, a joint school district and a union high school district.

(b) “Common school district” means a school district, other than a union high school district, formed primarily to provide education in all or part of kindergarten through grade 12 to pupils residing within the district.

(c) “Joint school district” means a common or union high school district with territory in more than one county.

(d) “Union high school district” means a school district, other than a common school district, that is responsible for education in high school grades but not in primary grades, formed in accordance with ORS 335.210 to 335.485 (1963 Replacement Part).

(e) “Governing body of the county” means the county court, the board of county commissioners or the unit of government designated by the county charter to exercise the power or duty prescribed in the section in which the term occurs.

(f) “Most populous district” means the school district that has the largest number of pupils in average daily membership, as defined in ORS 327.006.