Property tax in Johnson County, Illinois
In Johnson County, the property tax bill comes from the Johnson County Treasurer (the county collector). Every due date for the 2025 Payable 2026 bill has passed, and the county had not posted the next cycle's dates when we checked. You can look up and pay the bill on the county's own payment page. Taken from Johnson County's own pages, checked September 23, 2026.
The median property tax bill in Johnson County, Illinois is $1,992 a year, which is about 1.24% of the county's median home value of $160,500. That effective rate is lower than the typical Illinois county (1.81%) and higher than the national median (0.81%). These are American Community Survey 5-year estimates (2024); your own bill depends on your home's assessed value and any exemptions.
Who sends the property tax bill in Johnson County, and how do you pay it?
The bill comes from the Johnson County Treasurer (the county collector). The value it is based on is set by a separate office, the Johnson County Supervisor of Assessments, with the township assessors, which is who to ask if the value looks wrong. For how to look up and pay the bill, go to the county's own payment information.
Johnson County has no county website with tax pages. Bills, due dates and payment status are on the county's online tax inquiry, which also links to an outside payment site. You can also call the Treasurer's office in Vienna at 618-658-8042. One county bill carries the taxes of every local district the property sits in, including schools, cities, the community college and road districts. A Board of Review decision can be appealed to the Illinois Property Tax Appeal Board.
When are property taxes due in Johnson County?
Every due date for the 2025 Payable 2026 bill has passed, and Johnson County had not posted the next cycle's dates when we checked on September 23, 2026. If that bill is still unpaid, the late-payment rules below apply to it. Counties usually repeat the schedule, but confirm the new dates on your next bill. For the 2025 Payable 2026 bill, Johnson County splits the bill into 2 payments, the first due August 14, 2026 and the last September 18, 2026. An installment not paid by its due date is charged interest of 1.5% a month, or part of a month, starting the day after the due date, as Illinois law requires. Taxes that stay unpaid are offered at the county's annual tax sale.
| Payment | Due | Note |
|---|---|---|
| First installment | August 14, 2026 (passed) | |
| Second installment | September 18, 2026 (passed) |
From Johnson County's published schedule, checked September 23, 2026. The county had not posted a calendar labeled for this cycle when we checked, so these dates come from state law and the county's standing schedule; the date on your bill is the one that binds you.
Estimate the property tax on a home in Johnson County
Enter a home's market value for a ballpark at Johnson County's average effective rate of 1.24% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.
Estimated property tax: $1,990 / year
Property tax in Johnson County at a glance
| Measure | Value |
|---|---|
| Median annual property tax | $1,992 |
| Median home value | $160,500 |
| Effective tax rate | 1.24% |
| Typical Illinois county rate | 1.81% |
| National median county rate | 0.81% |
Effective rate = median real estate taxes paid divided by median home value. Source: U.S. Census Bureau, American Community Survey 5-year estimates.
How does Johnson County compare in Illinois?
Among Illinois's 102 counties, Johnson County has the 98th highest effective property-tax rate: 97 rank higher and 4 rank lower. That places it among the least taxed counties in the state. Nationally, it ranks 680th of 3135 US counties by effective rate. See every Illinois county ranked.
How much do homeowners in Johnson County actually pay?
The median is only the middle bill. Across Johnson County's 3,362 owner-occupied homes, 33.9% pay $3,000 or more a year in property tax, 46.5% pay at least $2,000, and 24.3% pay under $800. Another 6.7% report paying no property tax at all, which usually means an exemption covers the whole bill.
| Annual bill | Homes | Share |
|---|---|---|
| Under $800 | 818 | 24.3% |
| $800 to $1,499 | 384 | 11.4% |
| $1,500 to $1,999 | 372 | 11.1% |
| $2,000 to $2,999 | 422 | 12.6% |
| $3,000 or more | 1,140 | 33.9% |
| No property tax paid | 226 | 6.7% |
Owners with a mortgage pay a median of $3,120 and owners without one pay $1,608. Owners who have paid off a home have usually held it longer, and in states that cap how fast an existing owner's assessment can rise, long-held homes carry lower assessed values. Census table B25103.
How does the Johnson County property tax bill compare with local incomes?
The median property tax bill of $1,992 is about 2.9% of the median income of Johnson County homeowner households, $68,636 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 82% of Johnson County's occupied homes are lived in by their owners; renters pay property tax too, just folded into rent.
Have property taxes gone up in Johnson County?
Yes. The median bill went from $1,620 in 2015-2019 to $1,992 in 2020-2024, a 23% rise. Over the same span the median home value moved 46.6%, from $109,500 to $160,500. Bills rose more slowly than values, which is what assessment caps and falling millage rates do: the county is taxing a smaller share of each home's worth.
Two Census ACS 5-year periods with no survey years in common, in each period's own dollars. A change counts only if it exceeds the combined 90% margin of error.
Property tax in counties next to Johnson County
Johnson County borders 6 counties.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Williamson County, IL | 1.72% | $2,690 | $156,400 |
| Saline County, IL | 1.69% | $1,597 | $94,300 |
| Massac County, IL | 1.4% | $1,704 | $121,900 |
| Union County, IL | 1.3% | $1,712 | $131,700 |
| Johnson County, IL (this county) | 1.24% | $1,992 | $160,500 |
| Pope County, IL | 1.03% | $1,477 | $143,800 |
| Pulaski County, IL | 1.02% | $869 | $85,100 |
How is a home assessed in Johnson County?
Illinois assesses homes at 33.33% of market value in every county, Johnson County included. How Illinois assesses and reappraises homes.
Is there a homestead exemption in Johnson County?
Yes. Illinois's General Homestead Exemption is $6,000 of equalized assessed value in most counties, $8,000 in counties next to Cook, and $10,000 in Cook County. That is the Illinois rule, and it applies in Johnson County. Illinois's exemptions and relief programs in full.
How to appeal your Johnson County property assessment
In Johnson County you appeal to the Johnson County Board of Review. The deadline: Under Illinois law, a complaint must be filed within 30 calendar days after the county publishes the assessment list for the year. The county does not post its publication date online; the Supervisor of Assessments (618-658-8010) can give it. Checked September 23, 2026 against state law, because Johnson County does not restate them on its own pages.
How Illinois's appeal process works, including the next level if the first one turns you down.
Illinois rules from primary state sources, reviewed September 7, 2026; sources on the Illinois page.
Work out your own numbers
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How much house can I afford?
Your income, debts and down payment against the 28/36 rule lenders actually use, with Johnson County's tax rate to hand.
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Mortgage calculator
Monthly payment with principal, interest, tax and insurance, plus what an extra payment saves you.
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Illinois income tax
Brackets, standard deduction and what Illinois actually taxes.
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Sales tax in Johnson County
The other local tax: combined state and local rate for this county.
Sources
- Median real estate taxes paid and median home value for Johnson County, Illinois: U.S. Census Bureau, American Community Survey 5-year estimates (2020-2024), tables B25103, B25077, B25102, B25119 and B25003; the five-year comparison uses the 2015-2019 estimates. Neighboring counties: Census county adjacency file.