Illinois · FIPS 17199 · ACS 2020–2024
Williamson County, Illinois property tax rate
Homeowners in Williamson County paid a median of $2,690 a year in real estate taxes on a median home value of $156,400 (2020–2024 survey). Taxes came to 1.57% of home value, 16% below the Illinois rate of 1.88% and 67% above the U.S. rate of 0.94%.
- 1.57%Effective tax rate±0.11% margin · Illinois: 1.88%
- $2,690Median tax per yearIllinois: $5,298 · U.S.: $3,119
- $156,400Median home valueIllinois: $263,300
- 20,477Owner-occupied homes71% of households own
| Measure | Williamson County | Illinois | U.S. | Williamson County 2019–2023 | Change |
|---|---|---|---|---|---|
| Effective tax rate | 1.57% | 1.88% | 0.94% | 1.53% | +0.04 pts |
| Median tax, all owners | $2,690 | $5,298 | $3,119 | $2,490 | +$200 (+8.0%) |
| Median tax, with a mortgage | $3,136 | $5,833 | $3,489 | $2,924 | +$212 (+7.3%) |
| Median tax, no mortgage | $2,062 | $4,463 | $2,576 | $1,729 | +$333 (+19.3%) |
| Median home value | $156,400 | $263,300 | $332,700 | $145,600 | +$10,800 (+7.4%) |
| Total taxes paid | $62,902,700 | $20,991,766,400 | $360,573,527,500 | $58,997,400 |
How Williamson County compares
- Per $1,000 of home value, owners here paid about $15.74 a year, against $18.76 statewide and $9.40 nationally.
- Rank in Illinois: 40 of 95 counties from lowest to highest effective rate (among those with reliable estimates). Nationally, 94% of 2,682 counties had a lower rate.
- Homes with a mortgage: 1.69% of value; homes without one: 1.40%. Median bills: $3,136 and $2,062.
- Compared with the 2019–2023 survey, the effective rate rose (+0.04 pts) and the median tax changed +$200 (+8.0%). The two 5-year surveys share four years of responses, so year-to-year moves are small and partly noise.
- Margin of error: the effective rate is 1.57% ± 0.11% at 90% confidence, from a sample of the 20,477 owner-occupied homes.
Illinois counties with similar rates
| County | Effective rate | Median tax | Median value |
|---|---|---|---|
| Marion County | 1.54% | $1,759 | $103,000 |
| Cass County | 1.55% | $1,958 | $97,100 |
| Schuyler County | 1.55% | $1,950 | $109,700 |
| Jasper County | 1.56% | $2,448 | $125,500 |
| Jersey County | 1.58% | $3,020 | $171,900 |
| Washington County | 1.58% | $2,908 | $155,700 |
| Jefferson County | 1.58% | $2,148 | $126,000 |
| Vermilion County | 1.62% | $1,757 | $97,200 |
Sources
- U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, table-based summary file: B25090 (aggregate real estate taxes), B25082 (aggregate home value), B25103 (median real estate taxes), B25077 (median home value) and B25003 (tenure); files dated January 29, 2026.
- U.S. Census Bureau, American Community Survey 2019–2023 5-year estimates, same tables (files dated October 31, 2024), for the comparison column.
- Geography names: Census Bureau Geos20245YR.txt (file dated January 22, 2026).
Effective rate = total real estate taxes paid by owner-occupied homes ÷ their total value, as reported by owners to the Census Bureau. It is not a millage rate. Your bill depends on your assessed value, exemptions (such as homestead) and local levies.