Offices: 8910 S. Route 23
Township Hall: 9312 Riley Road
Marengo, Illinois 60152

Riley Township Assessor

Riley Township 2017 Equalization

The 2017 Riley Township Equalization Factor will be 1.0396. This was determined by the Illinois Department of Revenue in a three-year sales ratio study which analyzes the arms’ length sales that have occurred in 2014, 2015 and 2016 and compares them to the prior year’s assessment values. The sales ratio study is done by the Illinois Department of Revenue for every county and township in the State of Illinois annually. The most recent data has determined that the 2017 assessments in Riley Township must be increased by 3.96% over the 2016 assessment levels because the market sales over the last three years are now higher than the assessment value levels in place.

  • The 2017 equalization factor of 1.0396 DOES NOT mean that house values have increase 3.96%.
  • THIS EQUALIZATION FACTOR DOES NOT MEAN YOUR TAX BILL WILL INCREASE BY 3.96%.
  • PLEASE NOTE THAT AN INCREASE IN THE EQUALIZATION FACTOR IS NORMALLY ACCOMPANIED BY A DECREASE IN THE TAX RATE: AS AN REAL EXAMPLE, THE 2015 TAX RATE FOR TAX CODE 16001 WAS 10.499982%, WHEN ASSESSMENTS INCREASED IN 2016 BY AN EQUALIZATION FACTOR OF 8.36%, THE TAX RATE REDUCED TO 9.994840%.

If recent sales in your subdivision and neighborhood indicate that your parcel is overvalued after the application of the 2017 equalization factor, then that is a basis for an assessment appeal. Additionally, if your property or home is over-assessed compared to other similar properties or homes in your subdivision or neighborhood, this would also be a legitimate basis for an appeal. Property owners will not be able to appeal an assessment value based solely on the 1.0396 equalization factor.

Parcel and Sales Search

You need one of two things:
1) a Property Index Number, PIN, in the following format: 16-##-###-###. (All Riley Township PINs begin with 16)
2) or, any part of a address, home # or Street Name, (e.g. 8910 or Route 23)

***The data contained on this website is public record, made available by the Freedom of Information Act and Illinois Code. Use of this site is intended for research purposes only. Any other use is strictly forbidden.

Occasionally, this data may contain errors. Information gathered from this website cannot be used as a basis for argument until it has been verified as accurate by the Assessor's Office.***

By clicking the I Agree button below, you acknowledge that you understand and accept the above statement

I Agree

Riley Sales Spreadsheet

Click on the following links to see all 2016 and 2017 sales in the Township: PDF Document

McHenry County Appeal Forms and Links

If you would like to appeal your assessment click the link below, you can fill out, print, and submit appeals at the McHenry County website:
2017 Appeal Forms

McHenry County GIS

Click on the following link to see your Parcel via the McHenry County Aerial maps: McHenry County GIS

You can use the Layers Tools to view Parcel Dimensions, Farm Land Assessments or any other helpful layers. The Basemaps can be used to see the Aerial of the PIN you are researching.

McHenry County Assessment Link

Visit the following link for much more on Assessments in the McHenry County: McHenry County Assessments Website


If you have any questions or concerns, or would like to correct any erroneous information, please contact the assessor.