Will County Supervisor of Assessments
2020 Equalization Factors



  PIN Starts with: Township: Factor: Property Class Applied To:  
  07-01 Wheatland 1.0290 Residential Only  
  12-02 DuPage 1.0500 Residential Only  
  06-03 Plainfield 1.0495 Residential Only  
  11-04 Lockport 1.0550 Residential Only  
  16-05 Homer 1.0395 Residential Only  
  05-06 Troy 1.0425 Residential Only  
  30-07 Joliet 1.0760 Residential Only  
  15-08 New Lenox 1.0320 Residential Only  
  19-09 Frankfort 1.0275 Residential Only

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  04-10 Channahon 1.0475 Residential Only  
  10-11 Jackson 1.0235 Residential Only  
  14-12 Manhattan 1.0000 All  
  18-13 Green Garden 1.0140 Residential Only  
  21-14 Monee 1.0545 Residential Only  
  23-15  or  23-16 Crete 1.0640 Residential Only  
  03-17 Wilmington 1.0201 Residential Only  
  09-18 Florence 1.0090 Residential Only  
  13-19 Wilton 1.0090 Residential Only  
  17-20 Peotone 1.0000 All  
  20-21 Will 1.0000 All

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  22-22  or  22-23 Washington 1.0638 Residential Only  
  02-24 Reed 1.0590 Residential Only  
  01-24  or  01-25 Custer 1.0075 Residential Only  
  08-24  or  08-25 Wesley 1.0000 All  


Equalization is the application of a uniform percentage increase or decrease to assessed values of various areas or classes of property in order to bring assessment levels, on average, to the same percentage of market value. Equalization of assessed values is important (and performed) at each level of government - township, county and state. Chief County Assessment Officers (CCAO), County Boards of Review and the State possess certain powers to equalize assessments.

In Will County, on an annual basis the Chief County Assessment Officer determines the level of assessment in each township based upon the sales transactions that have occurred in the three years prior to the assessment date. This year’s assessment valuation data is January 1, 2020. In analyzing the sales from the three previous years (2017, 2018, 2019) the CCAO takes the median level of assessment for each of those years, averages those medians, to determine the adjustment in assessments required in a township. Once the assessor has completed their assessment roll for the year, the CCAO analyzes the changes in assessments by class (residential, commercial and industrial) and determines what further adjustments are needed in a township, by applying a township multiplier to all non-farm parcels in the jurisdiction.

The equalization process is intended to bring the three-year average of the median assessment levels in a township to 33.33% of market value, which is our statutory requirement in Illinois.


PUB-136 - Property Assessment and Equalization information provided by the Illinois Department of Revenue.

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