Will County Supervisor of Assessments
2019 Equalization Factors



  PIN Starts with: Township: Factor: Property Class Applied To:  
  01- Wheatland 1.0225 Residential Only  
  02- DuPage 1.0448 Residential Only  
  03- Plainfield 1.0100 Residential Only  
  04- Lockport 1.0000 All  
  05- Homer 1.0116 Residential Only  
  06- Troy 1.0000 All  
  07- Joliet 1.0822 Residential Only  
  08- New Lenox 1.0031 Residential Only  
  09- Frankfort 1.0296 Residential Only

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  10- Channahon 1.0000 All  
  11- Jackson 1.0000 All  
  12- Manhattan 1.0000 All  
  13- Green Garden 1.0200 Residential Only  
  14- Monee 1.0226 Residential Only  
  15- or 16- Crete 1.0220 Residential Only  
  17- Wilmington 1.0233 Residential Only  
  18- Florence 1.0700 Residential Only  
  19- Wilton 1.0729 Residential Only  
  20- Peotone 1.0000 All  
  21- Will 1.0460 Residential Only

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  22- or 23- Washington 1.0650 Residential Only  
  24- or 25- Reed 1.0450 Residential Only  
  24- or 25- Custer 1.0700 Residential Only  
  24- or 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, 2019. In analyzing the sales from the three previous years (2016, 2017, 2018) 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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