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.