Home and mortgage
Williamson County, IL Property Tax Calculator
Williamson County homeowners pay a median $2,690 a year in property tax, 1.72% of a median $156,400 home: below Illinois's 2.01% but above the national 0.94%.
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Property tax in Williamson County by home value, at 1.72%
| Home value | A year | A month |
|---|---|---|
| $80,000 | $1,376 | $115 |
| $120,000 | $2,064 | $172 |
| $160,000 | $2,752 | $229 |
| $230,000 | $3,956 | $330 |
| $310,000 | $5,332 | $444 |
Williamson County against Illinois and the US
| Effective rate | Median tax | Median home value | Median household income | |
|---|---|---|---|---|
| Williamson County | 1.72% | $2,690 | $156,400 | $65,604 |
| Illinois | 2.01% | $5,298 | $263,300 | $83,390 |
| United States | 0.94% | $3,119 | $332,700 | $80,734 |
How this calculator works
Median real estate taxes paid ÷ median home value in Williamson County, from the Census Bureau's American Community Survey 2020–2024 5-year estimates. The calculator starts at the county's median home value and rate.
Questions people ask
What is the property tax rate in Williamson County?
The effective rate is 1.72%: a median $2,690 a year on a median $156,400 home. That's the 27th highest of the 28 Illinois counties we cover.
How much is property tax on a $400,000 house in Williamson County?
About $6,880 a year, $573 a month, at the county's effective rate, before any exemption.
How does Williamson County compare with the rest of Illinois?
Its rate is below the state's 2.01%. Across Illinois, covered counties range from 1.58% to 2.58%.
How do I lower my Williamson County property tax?
Apply for every exemption you qualify for, such as a homestead exemption, and appeal your assessment if it is higher than comparable homes sold nearby; the county assessor explains the deadlines.
Other Illinois counties
- Lake County
- DeKalb County
- Winnebago County
- Kendall County
- McHenry County
- Rock Island County
- Kane County
- Will County
- Peoria County
- Kankakee County
- Boone County
- McLean County
- Macon County
- LaSalle County
- Tazewell County
- Champaign County
- Ogle County
- DuPage County
- Whiteside County
- St. Clair County
- Grundy County
- Sangamon County
- Madison County
- Cook County
- Jackson County
- Vermilion County
- Adams County
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Sources
Updated by the RateHerald team. The maths is tested against worked examples; report a problem.