Williamson County, Illinois property tax
The median homeowner in Williamson County, Illinois pays $2,490 a year in property tax on a home worth $145,600, an effective rate of 1.71%. The national effective rate is 0.98%.
What the rate means here
At 1.71%, Williamson County taxes property more heavily than the country as a whole, which sits at 0.98%. That combination is the usual one. Houses here are worth $145,600 against a national $303,400, and a smaller tax base has to be taxed at a higher percentage to fund the same schools and roads. Whether the state also leans on property tax by choice, as several do in place of an income tax, is a separate question the rate alone cannot answer.
It ranks #61 of 97 Illinois counties by effective rate, against a statewide 2.07%, and #190 nationally. The state runs from 2.68% in Lake County down to 0.82% in Pulaski County.
The median home costs 2.22 times the median household income of $65,521, against 3.86 nationally, which is a comfortable ratio by American standards. 71.13% of occupied homes are owned rather than rented, and cheap housing relative to income is usually why. With 66,902 residents, the sample behind these medians is small, and the survey's own margins of error are correspondingly wider.
The rate is derived rather than quoted. How and why.
What that costs at different home values
Arithmetic at the county effective rate, before any exemption or assessment cap.
Housing and income
| Williamson County | Illinois | United States | |
|---|---|---|---|
| Effective property tax | 1.71% | 2.07% | 0.98% |
| Median tax bill | $2,490 | $5,189 | $2,969 |
| Median home value | $145,600 | $250,500 | $303,400 |
| Median gross rent | $897 | $1,227 | $1,348 |
| Median household income | $65,521 | $81,702 | $78,538 |
| Home price to income | 2.22× | 3.07× | 3.86× |
| Rent as share of income | 16.43% | 18.02% | 20.6% |
| Owner-occupied | 71.13% | 66.84% | 65.02% |
Source: U.S. Census Bureau, American Community Survey 2023 five-year estimates. Population 66,902.
Nearby counties of similar size
| County | Rate | Median bill | Home value |
|---|---|---|---|
| Adams County | 1.58% | $2,461 | $155,900 |
| Vermilion County | 1.79% | $1,666 | $92,900 |
| Whiteside County | 2.13% | $2,676 | $125,800 |
| Boone County | 2.27% | $4,507 | $198,600 |
| Grundy County | 2.03% | $5,260 | $259,200 |
Williamson County property tax: common questions
What is the property tax rate in Williamson County, Illinois?
The effective rate is 1.71% of home value, from a median tax bill of $2,490 against a median home value of $145,600. That is 0.73 points above the national 0.98%.
How much is property tax on a $400,000 home in Williamson County?
Roughly $6,840 a year at the county effective rate of 1.71%.
Is Williamson County expensive compared with the rest of Illinois?
It ranks #61 of 97 Illinois counties by effective property tax rate, and #190 of 2,826 nationally. That is 0.36 points below the Illinois average of 2.07%.
What does housing cost in Williamson County?
The median home is worth $145,600 and median gross rent is $897 a month. Median household income is $65,521, which puts the home at 2.22 times annual income and rent at 16.43% of it.