Property Tax in DeKalb County, Illinois

What the DeKalb County numbers mean

A median is the middle household: half of owner-occupied households in DeKalb County pay more than $5,889, and half pay less. Your own bill is set by your home's assessed value, the exemptions you qualify for, and the local taxing districts your property sits in — so individual bills vary widely around the median.

Dividing the median tax by the median home value gives a derived effective rate of 2.54% for DeKalb County. It is an estimate built from two survey medians, not the county's official rate, but it is a fair way to compare the local tax burden with other counties where home values are very different.

DeKalb County by the numbers

*Estimate derived from Census medians (tax ÷ value), not an official rate.

DeKalb County at a glance

• Median tax rank in Illinois: #8 of 102 counties
• Median home value rank in Illinois: #10 of 102
• Population rank in Illinois: #20 of 102 (100,512 residents)
• Population density rank: #19 of 102 (159 people per square mile)
• Land area rank in Illinois: #30 of 102 (631 sq mi, 1.1% of the combined county land area)
• Median tax as a monthly figure: $491; per $1,000 of home value: $2.54

How DeKalb County compares

The median tax bill in DeKalb County is about 13% higher than the state median ($5,189 for Illinois) and about 98% higher than the US median ($2,969 nationally). By median taxes paid, the county ranks #8 out of 102 Illinois counties with published Census data — 7 counties in the state have a higher median bill.

Comparisons cut both ways: a county can have a modest rate but high bills because homes are expensive, or a high rate but modest bills because homes are cheaper. DeKalb County's derived rate of 2.54% sits above the derived US figure of 0.98%.

Some extra context for DeKalb County: the median bill works out to about $491 a month, and the derived rate equals roughly $2,539 of tax per $100,000 of home value. The county is home to 100,512 people — the #20 most populous county in Illinois, spread over 631 square miles, a density of about 159 people per square mile. Its median home value, $231,900, ranks #10 among the state's 102 counties with data.

Zooming out: of 3133 counties nationwide with published Census figures, only 85 record a higher median tax bill than DeKalb County — it sits in the top 3% nationally. The county holds roughly 0.8% of Illinois's people. Its homes are worth less than the state norm (median $231,900 versus $250,500), and a decade at the derived rate of 2.54% adds up to about 25.39% of the median home's value in tax. The cheapest county in the state, Pulaski County, medians $668 — $5,221 less than DeKalb County per year.

Counties nearest DeKalb County in the Illinois ranking

DeKalb County and its population peers

For a like-for-like sense of scale, compare DeKalb County with its national population peers: the counties nearest to its 100,512 residents, listed in the table below with their own Census medians. Of the 9 counties in that group, DeKalb County's median bill of $5,889 is the highest.

The closest population match is Grant County, Washington (100,428 residents), where the median real estate tax paid is $2,268 on a median home value of $275,700 — $3,621 more than DeKalb County pays.

DeKalb County's nearest population neighbours within Illinois are Kankakee County (106,833 residents, median tax $4,125 on a median value of $185,700); Macon County (102,591 residents, median tax $2,560 on a median value of $121,800); Vermilion County (73,179 residents, median tax $1,666 on a median value of $92,900); Williamson County (66,902 residents, median tax $2,490 on a median value of $145,600). Comparing them is a reminder that even inside one state's rules, the bill follows local home values and local district rates more than anything decided at the state level.

How the tax is worked out

The bill is built in stages. First the assessor puts a market value on the property. Exemptions — a homestead exemption above all — then reduce the taxable amount. Finally the combined local rate is applied. To see the scale: at the county's derived rate of 2.54%, each $100,000 of value corresponds to about $2,539 of tax a year, and a $400,000 home to roughly $10,156. Real bills use the official assessment and district rates, not this derived figure, so treat the example as a sense of scale only.

Illustrative bills in DeKalb County at the derived rate

The derived rate of 2.54% is only an estimate built from medians, but applying it to different home values gives a sense of scale for DeKalb County — and a quick way to compare with the state derived rate of 2.07% and the US figure of 0.98%:

Illustration only: real bills are computed from the assessed value, exemptions, and the combined rates of the property's actual taxing districts.

Checking your assessment in DeKalb County

If your bill looks wrong, work through these steps:

1. Get your property record card from the assessor and check the basics — living area, lot size, bedrooms, condition, and any exemptions you should have.
2. Compare your assessed value with recent sale prices of similar homes in DeKalb County.
3. Talk to the assessor's office informally first; clear errors are often fixed without a hearing.
4. If needed, file a formal appeal with the local review board before the deadline on your assessment notice, with your evidence attached.
5. Keep paying the bill as issued while the appeal runs, unless your notice says otherwise — unpaid taxes accrue penalties regardless of an appeal.

More Illinois counties

• Macon County, IL — $2,560
• Kankakee County, IL — $4,125
• LaSalle County, IL — $3,336
• Vermilion County, IL — $1,666
• Tazewell County, IL — $3,481
• Williamson County, IL — $2,490

Frequently asked questions