(35 ILCS 200/9-220)
    Sec. 9-220. Division into assessment districts; assessment years; counties of 3,000,000 or more.
    (a) Notwithstanding any other provision in this Code to the contrary, until January 1, 1996, the county board of a county with 3,000,000 or more inhabitants may by resolution divide the county into any number of assessment districts. If the county is organized into townships, the assessment districts shall follow township lines. The assessment districts shall divide, as near as practicable, the work of assessing the property in the county into equal parts but neither the area nor the number of parcels need be equal in the assessment districts. The resolution shall number the assessment districts and provide for a general reassessment of each district at regular intervals determined by the county board.
    (b) Beginning January 1, 1996, in counties with 3,000,000 or more inhabitants, assessment districts shall be subject to general reassessment according to the following schedule:
        (1) The first assessment district shall be subject to general reassessment in 1997 and
    
every 3 years thereafter.
        (2) The second assessment district shall be subject to general reassessment in 1998 and
    
every 3 years thereafter.
        (3) The third assessment district shall be subject to general reassessment in 1996 and
    
every 3 years thereafter.
    The boundaries of the 3 assessment districts are as follows: (i) the first assessment district shall be that portion of the county located within the boundaries of a municipality with 1,000,000 or more inhabitants, (ii) the second assessment district shall be that portion of the county that lies north of State Route 64 (North Avenue) and outside the boundaries of a municipality with 1,000,000 or more inhabitants, and (iii) the third assessment district shall be that portion of the county that lies south of State Route 64 (North Avenue) and outside the boundaries of a municipality with 1,000,000 or more inhabitants.
(Source: P.A. 88-455; 89-126, eff. 7-11-95.)