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CITY

Seneca

Illinois · 2,310 residents (2025 est.) · 6.205 sq mi
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The short version

Seneca has roughly average household income, with a median household income of $86,830. Population has grown 19% since 2000. 15% of adults hold a bachelor's degree or higher, below the national rate of 36%. Median home value has more than doubled since 2000, reaching $227,500. The poverty rate of 22.2% is well above the national figure.

At a glance
Wealthier
above the US median
US median: $82,259
Younger
median age 35.5
US median: 38.9
Less educated
15% hold a bachelor's degree
US average: 36%
Stable housing
home values roughly flat, inflation adjusted
US median home: $376,019
Section 01

Population & growth

Total population
2,450
+19%since 2000
from 2,053 in 2000
1990 – 2025
Population density
395 / sq mi
+19%since 2000
from 331 / sq mi in 2000
US average: 281
Median age
35.5
−1%since 2000
from 35.7 in 2000
US average: 38.9

PEP 2025 EST:2,310 residents (Census Bureau Vintage 2025, released March 2026)

Population, 1990 – 2024
2K2K2K2K3K1990201020202024Seneca
20242K
1990201020202024
Section 02

Income & economy

Median household income
$86,830
−9%inflation adjusted, since 2000
from $52,188 in 2000
US average: $82,259
1990 – 2024
Per capita income
$41,006
+113%since 2000
from $19,273 in 2000
US average: $44,673
Households earning $100K+
54.1%
+19.7 ptssince 2009
from 34.5% in 2009
US average: 53.3%
Poverty rate
22.2%
+14.9 ptssince 2000
from 7.3% in 2000
US average: 12.5%
Income inequality (Gini)
0.374
+8%since 2010
from 0.346 in 2010
US average: 0.476
Workforce by industry, 2024
Finance & insurance18.8%
US avg: 5.9%
Retail trade13.6%
US avg: 9.9%
Professional, scientific, technical9.6%
US avg: 5.1%
Education & health services9.2%
US avg: 0.9%
Information8.6%
US avg: 10.8%
Wholesale trade7.2%
US avg: 6.9%
Other services2.1%
US avg: 6.7%
Public administration1.6%
US avg: 4.8%
Arts, entertainment, food1.1%
US avg: 1.9%
Agriculture, forestry, fishing0.4%
US avg: 1.6%
Construction0.4%
US avg: 1.2%
Transportation & warehousing0.4%
US avg: 2.2%
Manufacturing0%
US avg: 0.4%
BARS: THIS PLACE · TICKS: US AVERAGE
Section 03

Housing

Median home value
$227,500
+19%inflation adjusted, since 2000
from $105,100 in 2000
US average: $376,019
1990 – 2024
Median gross rent
$1,149
+25%inflation adjusted, since 2000
from $505 in 2000
US average: $1,442
Owner-occupied
81.3%
−0.3 ptssince 2000
from 81.6% in 2000
18.7% rent
Vacancy rate
6.3%
+4.2 ptssince 2009
from 2.1% in 2009
US average: 10.0%
Owner cost-burdened
15.6%
−7.2 ptssince 2009
from 22.8% in 2009
US average: 22.9%
Renter cost-burdened
18.2%
+0.8 ptssince 2009
from 17.4% in 2009
US average: 47.4%
Afford Score
2.6
+30%since 2000
from 2.0 in 2000
1990 – 2024
Gentrification Score
29
RELATED:See current rent listings in Seneca on RentDataNow
Section 04

Race & ethnicity

2000
White, non-Hispanic98%(2,011)
Black0%(0)
Hispanic / Latino1.5%(30)
Asian0%(1)
Other0%
Diversity Score3.7%(77)
2024
White, non-Hispanic86.6%(2,121)
Black0.9%(22)
Hispanic / Latino10%(246)
Asian0%(0)
Other2.5%(61)
Diversity Score30%(734)
Diversity Score
30
+701%since 2000
from 4 in 2000
1990 – 2024
Section 05

Education

Bachelor's degree or higher
14.9%
+2.0 ptssince 2000
from 12.9% in 2000
US average: 35.6%
High school or higher
93.9%
+7.5 ptssince 2000
from 86.4% in 2000
US average: 89.6%
Graduate degree
2.8%
−1.5 ptssince 2000
from 4.3% in 2000
US average: 14.0%
Section 06

Commute & transportation

Average commute
26.2 min
+33%since 2000
from 19.8 min in 2000
US average: 26.5
Drive alone to work
77.8%
−12.5 ptssince 2009
from 90.3% in 2009
US average: 68.9%
Carpooled to work
6.8%
+0.8 ptssince 2009
from 6.0% in 2009
US average: 8.5%
Public transit
0.0%
Unchangedsince 2009
from 0.0% in 2009
US average: 3.2%
Worked from home
8.2%
+5.3 ptssince 2009
from 2.9% in 2009
US average: 15.0%
Walked to work
5.9%
+5.1 ptssince 2009
from 0.8% in 2009
US average: 2.4%
Biked to work
0.0%
Unchangedsince 2009
from 0.0% in 2009
US average: 0.4%
No vehicle available
1.7%
+0.9 ptssince 2009
from 0.7% in 2009
US average: 8.3%
Section 07

Work & employment

Unemployment rate
4.0%
−4.6 ptssince 2011
from 8.6% in 2011
US average: 5.2%
Labor force participation
57.9%
−5.1 ptssince 2011
from 63.0% in 2011
US average: 63.5%
Self-employed
10.5%
−6.8 ptssince 2009
from 17.3% in 2009
US average: 13.1%
Management & professional
20.8%
−41.7 ptssince 2009
from 62.5% in 2009
US average: 42.5%
Section 08

People & community

Male
54.1%
+4.7 ptssince 2009
from 49.4% in 2009
Female
45.9%
−4.7 ptssince 2009
from 50.6% in 2009
Foreign born
2.0%
+1.4 ptssince 2009
from 0.7% in 2009
US average: 14.1%
Veterans
11.2%
−37.4 ptssince 2009
from 48.6% in 2009
US average: 6.2%
With a disability
10.0%
−0.9 ptssince 2012
from 10.9% in 2012
US average: 13.3%
Uninsured
4.8%
−85.7 ptssince 2013
from 90.5% in 2013
US average: 8.4%
Broadband at home
93.5%
+10.7 ptssince 2017
from 82.8% in 2017
US average: 91.0%
English only at home
96.8%
−1.8 ptssince 2016
from 98.6% in 2016
US average: 77.7%
Spanish at home
3.2%
+2.2 ptssince 2016
from 1.0% in 2016
US average: 13.6%
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Compare Seneca to nearby cities

SENECA VS
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Home value$247,400+9%
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SENECA VS
Ottawa
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Home value$154,000−32%
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SENECA VS
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SENECA VS
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Home value$315,600+39%
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Frequently asked

How many people live in Seneca, Illinois?

Seneca, Illinois has about 2,450 residents according to the 2024 American Community Survey.

What is the median household income in Seneca, Illinois?

The typical household in Seneca, Illinois earns about $86,830 a year. Half of households make more than that, and half make less.

Is Seneca, Illinois expensive?

In Seneca, Illinois, the median home is worth about $227,500, and the typical rent is about $1,149 a month.

How educated are people in Seneca, Illinois?

About 14.9% of adults age 25 and over in Seneca, Illinois hold a bachelor's degree or higher.

What is the poverty rate in Seneca, Illinois?

About 22.2% of people in Seneca, Illinois live below the federal poverty line.

Has Seneca, Illinois grown since 1990?

Yes, Seneca, Illinois has grown since 1990. The population has added about 591 residents, a change of about 32 percent over that period.

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DATA: US CENSUS BUREAU ACS 5-YEAR + DECENNIAL CENSUS · UPDATED 2024

How we source and harmonize this data →

Seneca, Illinois: demographics, income & housing data · CensusEasy