For the purpose of administering this part, the counties of this state are placed in the following classes:

(1) Class I -- Counties having less than 3,000 parcels of real property;

(2) Class II -- Counties having at least 3,000 but less than 8,000 parcels of real property;

(3) Class III -- Counties having at least 8,000 but less than 15,000 parcels of real property;

(4) Class IV -- Counties having at least 15,000 but less than 25,000 parcels of real property;

(5) Class V -- Counties having at least 25,000 but less than 35,000 parcels of real property;

(6) Class VI -- Counties having at least 35,000 but less than 50,000 parcels of real property;

(7) Class VII -- Counties having at least 50,000 but less than 100,000 parcels of real property; and

(8) Class VIII -- Counties having at least 100,000 or more parcels of real property.