(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.