20-6-301. High school district classification. The classification of a high school district must be the same as the classification of the elementary district (20-6-201) where the high school building is located. If there is more than one elementary district in which operating high school buildings are located, the classification of the high school district must be the same as the classification of the elementary district described in 20-6-201 in which the operating high school building that was first constructed is located. Whenever the classification of such elementary district is changed, the classification of a high school district must be changed accordingly and the county superintendent shall adjust the number of additional high school district trustee positions in accordance with the method prescribed in 20-3-354 for the determination of the number of additional trustee positions required for a high school district. An increased number of trustee positions must be filled by the appointment of the county superintendent, and those positions are subject to election at the next regular trustee election. When the number of positions is decreased, the next additional high school trustee positions that become vacant under any circumstances may not be filled until the number of trustee positions has been reduced to the number required by law.