Ottawa, Lasalle County, Illinois Property Taxes

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Property Taxes in Ottawa, Illinois

Median Ottawa, Illinois effective property tax rate: 3.43%, significantly higher than the national median of 1.02%, and higher than the Illinois state median of 2.33%.
Median Ottawa, Illinois home value: $140,955
Median annual Ottawa, Illinois tax bill: $4,334, $1,934 higher than the national median property tax bill of $2,400.

How are property taxes in LaSalle calculated?

Property taxes in Ottawa, Illinois are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding Ottawa's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Ottawa, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Ottawa, Lasalle County, Illinois Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

3.43%

Estimate Property Tax Bill

$4,835

$4,487

How Does the Ottawa Property Tax Calculator Work?

Use this Ottawa property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Ottawa's median effective tax rate of 3.43% — based on actual property records in LaSalle County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local assessment process uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Ottawa's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Ottawa: rates range from 3.43% in 61350 to 3.43% in 61350, primarily due to differences in school district levies and local assessment districts.

For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Ottawa.

About Ottawa Property Taxes

About Property Taxes in Ottawa, LaSalle, Illinois

Ottawa’s median effective property tax rate of 3.43% is higher than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the LaSalle County base levy combined with local school district levies and Special service areas (SSAs) that vary by subdivision throughout the city.

Property tax rates are not uniform across Ottawa. Homeowners in the 61350 ZIP code carry a median effective rate of 3.43%, while those in the lowest ZIP pay 3.43%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across LaSalle County. Understanding which part of Ottawa you live in can make a meaningful difference to your annual tax bill.

Ottawa homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the June 1, 2026 deadline each year.

If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.

Property Tax Rates Across Ottawa, Lasalle County, Illinois

As noted earlier, local government entities set tax rates, which can vary widely within a state.

Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.

While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.

Below, you can compare Ottawa's effective property tax rate to other cities in Illinois and the median property tax rates in Illinois and the U.S.

Property Tax Rates Across Ottawa, Lasalle County, Illinois

Source: Ownwell

2.04%

2.80%

3.56%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Ottawa Tax Rate

3.43%

Median Effective Lasalle County Tax Rate

2.91%

Median Effective Illinois Tax Rate

2.33%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Ottawa, Lasalle County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
61350	2.51%	3.04%	3.43%	3.43%	3.45%

Source: Ownwell

Property Tax Assessment Values Across Ottawa, Lasalle County, Illinois

When examining property taxes in Ottawa, Illinois, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The LaSalle County tax authority estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In LaSalle County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the season.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Ottawa.

For example, the median home price in Ottawa is $140,955, with tax bills ranging significantly across the county. 61350 has the highest median home price at $140,955.

Property Tax Assessment Values Across Ottawa, Lasalle County, Illinois

Source: Ownwell

$64,317

$170,619

$276,921

Median Ottawa Market Value

$140,955

Median Lasalle County Market Value

$101,838

Median Illinois Market Value

$227,888

Median United States Market Value

$235,294

Property Tax Assessment Values Across Ottawa, Lasalle County, Illinois

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
61350	$64,894	$92,929	$140,955	$203,482	$310,850

Source: Ownwell

Property Tax Bills Across Ottawa, Lasalle County, Illinois

How are property tax bills calculated in Ottawa?

Property tax bills in Ottawa are based on the assessed value of a home and the local tax rate set by taxing authorities. When a property’s assessed value rises, the tax bill can increase as well, even if the homeowner’s income does not change. The median home price in Ottawa is $140,955, and the median property tax bill is $4,334, which is above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%.

What factors affect the tax bill?

Several factors can influence the final amount, including the home’s market value, assessment level, and local levies. In Ottawa, property tax bills vary widely, with the 25th percentile at $3,008 and the 75th percentile at $6,507. For some homeowners, that can mean a manageable annual expense; for others, it can create a significant strain on monthly budgets.

Property Tax Bills Across Ottawa, Lasalle County, Illinois

Source: Ownwell

$1,866

$3,920

$5,974

Median Ottawa Tax Bill

$4,334

Median Lasalle County Tax Bill

$2,856

Median Illinois Tax Bill

$5,277

Median United States Tax Bill

$2,400

Property Tax Bills Across Ottawa, Lasalle County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
61350	$2,114	$3,008	$4,334	$6,507	$9,581

Source: Ownwell

Don't miss the deadline to appeal!

Dates
Appeal Deadline	June 1

Links
LaSalle Tax Assessor
Website	lasallecountysa.org

Frequently Asked Property Tax Questions in Ottawa, Illinois

How are property taxes calculated in Ottawa, Illinois?

Property taxes in Ottawa, Illinois are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.

How do I appeal my property taxes in Ottawa, Illinois?

To appeal your property taxes in Ottawa, Illinois, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.

What property tax exemptions are available in Ottawa, Illinois?

Common property tax exemptions in Ottawa, Illinois include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.

When are property taxes due in Ottawa, Illinois?

Property tax deadlines in Ottawa, Illinois vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.

How can Ownwell help reduce my property taxes in Ottawa, Illinois?

Ownwell provides professional property tax appeal services in Ottawa, Illinois. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.