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Williamson County, IL Property Tax Information

Gain insightful knowledge on property tax assessments, tax records, rates and exemptions

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Start you property tax research on You will find:

  • current property tax data on invidual properties,
  • an overview of the property appraisal process,
  • tax rates,
  • tax exemptions granted by different cities and local communities,
  • property and tax assessment values,
  • and more!

Search Property Tax Records in Williamson County, IL

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Sample Property Tax Report for a Williamson County, IL property

The State of Illinois does not have a statewide property tax. Property taxes are determined at local levels, and pay for services such as schools, libraries, park districts, fire protection districts and others. In Illinois, taxable property includes only real property such as land, buildings or permanent facilities. Additional information regarding property tax in Illinois can be found in the general tax guide.

Market Value

The Williamson County Supervisor of Assessments Office overviews the activity of the Township Assessors, which are in charge of establishing the market value for all taxable real property in Williamson County. Market value has been defined by The Supreme Court as the sale price of real estate as agreed upon between a willing buyer and willing seller, with neither being under duress to buy or sell.

Non-farm land value $39,990
Non-farm building value + $8,700
Market value = $48,690

Assessed Value

Assessed value is the foundation upon which taxing authorities determine the amount of real estate taxes to be paid. Currently, in Illinois, properties are assessed at 1/3 (or 33%) of their market value, with the exception of Cook County. Also, an equalization factor, or multiplier, is applied. This factor will either increase or decrease your property's assessed value. The assessment process takes place on an annual basis, while a general reassessment is required every four years in order to maintain or increase assessment uniformity.

Non-farm land assessed value $13,330
Non-farm building assessed value + $2,900
Assessed value = $16,230


A wide variety of property tax exemptions are available in Williams County, which may lower the property's tax bill. These are deducted from the assessed value to give the property's taxable value.

Due to the fact that no data regarding exemptions was provided, the total taxable value is equal to the total assessed value.

Property tax

Property tax is calculated by multiplying the taxable value by the corresponding tax rates and in this case is an estimate of what an owner NOT benefiting from tax exemptions or deductions would pay.
Actual taxes might differ from the figures displayed here due to various abatement and financial assistance programs.

Tax Description Assessed Value Tax Rate Tax Amount
Property Tax $16,230 x 6.0327% = $979.11

For more information please visit Williamson County's official webpage.

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