How much are property taxes in Seneca, IL?

Name: Property taxes in Seneca, IL, 2020–2024
Creator: US Census Bureau
License: https://www.census.gov/data/developers/about/terms-of-service.html

Homeowners in Seneca, IL pay a median of $3,627 (±$732) a year in real estate taxes (2020–2024 American Community Survey, table B25103).

Homes with a mortgage pay a median of $3,663.

Homes without a mortgage pay a median of $3,530.

That is about 1.6% of the median home value of $227,500.

In Seneca, the median real estate tax went from $2,614 in 2015–2019 to $3,627 in 2020–2024 (+38.8%).

Prices (CPI-U) rose 22.7% over the same years; the change is not measurably different from the rise in prices.

Figures last updated on November 12, 2026.

Median real estate taxes: $3,627 (±$732)
With a mortgage: $3,663
Without a mortgage: $3,530
Share of median value: 1.6%

Real estate taxes in Seneca against LaSalle County, its state and the nation

Median real estate taxes paid a year, estimate (90% margin of error)
	Seneca	LaSalle County	Illinois	United States
Median real estate taxes	$3,627 (±$732)	$3,418 (±$90)	$5,298 (±$22)	$3,119
Homes with a mortgage	$3,663 (±$645)	$3,753 (±$115)	$5,833 (±$28)	$3,489
Homes without a mortgage	$3,530 (±$1,724)	$2,950 (±$159)	$4,463 (±$30)	$2,576
Median home value	$227,500 (±$41,174)	$161,900 (±$2,651)	$263,300 (±$797)	$332,700

In Seneca, the median real estate tax is not measurably different from LaSalle County ($3,418).

It is also lower than in Illinois ($5,298).

It is not measurably different from the national figure ($3,119).

In LaSalle County, Seneca ranks 26 of 61 places with a published estimate, from highest to lowest median real estate taxes.

Statewide, it ranks 860 of 2,625.

Rankings use the estimates alone; where margins of error overlap, neighboring ranks may not truly differ.

Taxes as a share of home value in Seneca

The median tax ($3,627) is 1.6% of the median home value ($227,500).

Across LaSalle County the same ratio is 2.1%.

Across Illinois it is 2.0%.

This is a ratio of two medians, a rough effective rate: not the tax rate or mill rate the town, county or school district sets, and not any one home’s bill.

Owners report what they paid and what they think their home is worth; the assessor’s office publishes the actual rates and assessments.

How property taxes in Seneca have changed since 2015–2019

2015–2019 and 2020–2024 American Community Survey 5-year estimates
	2015–2019	2020–2024	Amount of change	Verdict
Median real estate taxes	$2,614 (±$204)	$3,627 (±$732)	+38.8%	No measurable change after inflation
Median home value	$161,000 (±$8,386)	$227,500 (±$41,174)	+41.3%	No measurable change after inflation
Median owner cost with a mortgage	$1,347 (±$102)	$1,684 (±$198)	+25.0%	No measurable change after inflation

The Census Bureau publishes 2015–2019 dollars in 2019 dollars and 2020–2024 dollars in 2024 dollars.

Prices (the CPI-U, US Bureau of Labor Statistics) rose 22.7% between 2019 and 2024, so a dollar figure’s verdict compares the two after raising the earlier one by that much, using the Census Bureau’s test for a difference.

The two periods do not overlap, as the Census Bureau recommends for 5-year estimates.

Median real estate taxes in places near Seneca

Nearest places with a published estimate, compared with Seneca
Place	Distance	Median real estate taxes	Compared with this place
Seneca	—	$3,627 (±$732)	—
Manlius Township (LaSalle County)	3.0 mi	$2,950 (±$328)	Not measurably different
Marseilles	3.7 mi	$2,609 (±$262)	Lower
Brookfield Township	4.4 mi	$4,174 (±$1,086)	Not measurably different
Norman Township	4.9 mi	$6,944 (±$1,582)	Higher
Erienna Township	5.4 mi	$6,901 (±$815)	Higher
Vienna Township	6.3 mi	$4,221 (±$663)	Not measurably different
Miller Township	7.5 mi	$4,138 (±$1,359)	Not measurably different
Kinsman	8.1 mi	$1,411 (±$669)	Lower

Nearby places with a measurably lower figure: Marseilles, IL ($2,609), Kinsman, IL ($1,411).

Nearby places with a measurably higher figure: Norman Township, IL ($6,944), Erienna Township, IL ($6,901).

Distance is measured in a straight line between the Census Bureau’s internal points for each place.

Median real estate taxes across LaSalle County, place by place

Rank	Place	Median real estate taxes
20	Brookfield Township	$4,174 (±$1,086)
21	Miller Township	$4,138 (±$1,359)
22	Ottawa	$4,011 (±$331)
23	Sheridan	$3,967 (±$502)
24	Vermillion Township	$3,933 (±$2,073)
25	Ophir Township	$3,667 (±$1,060)
26	Seneca	$3,627 (±$732)
27	Earl Township	$3,562 (±$210)
28	Ottawa Township	$3,551 (±$272)
29	Farm Ridge Township	$3,435 (±$471)
30	Meriden Township	$3,400 (±$2,858)
31	Earlville	$3,238 (±$278)
32	Oglesby	$3,230 (±$264)

Showing 13 of 61 places in LaSalle County, ranked from highest to lowest.

Survey years: 2020–2024 (American Community Survey 5-year estimates), compared with 2015–2019.

Margins of error are at the 90% confidence level.

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Questions about Seneca

How much are property taxes in Seneca?

The median real estate tax paid by homeowners in Seneca, IL is $3,627 (±$732) a year (2020–2024 American Community Survey).

What is the property tax rate in Seneca?

The Census Bureau does not publish tax rates; as a rough guide, the median tax paid is 1.6% of the median home value in Seneca, and the actual rate is set by the town, county and school district.

Have property taxes in Seneca gone up?

In Seneca, the median real estate tax went from $2,614 in 2015–2019 to $3,627 in 2020–2024 (+38.8%).

Prices (CPI-U) rose 22.7% over the same years; the change is not measurably different from the rise in prices.

Are property taxes in Seneca higher than in LaSalle County?

In Seneca, the median real estate tax is not measurably different from LaSalle County ($3,418).

It is also lower than in Illinois ($5,298).

It is not measurably different from the national figure ($3,119).

Sources

To check these figures in the Census Bureau’s own API, request the variables below from the 2024 ACS 5-year data profile (acs/acs5/profile) and detailed tables (acs/acs5) for Seneca village, Illinois (place:68640, in state:17).

Each estimate (E or PE) has a margin of error beside it (M or PM).

The 2015–2019 figures are B25103_001E, B25103_001M, B25077_001E, B25077_001M, B25088_002E, B25088_002M from the 2019 release.

The API needs a free key.

Request a Census API key.

B25103_001E, B25103_001M, B25103_002E, B25103_002M, B25103_003E, B25103_003M, DP04_0089E, DP04_0089M

This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.

Figures are published by the US Census Bureau, HUD, the Bureau of Labor Statistics and the FBI; Seayora reproduces them and does not adjust them, except where a sentence says it compares dollar figures after inflation. They describe the whole place, not any one building or street, and are not an appraisal, a rent determination, a tax bill, a safety rating or legal advice.