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CITY · 1990 CENSUS

Seneca

Illinois · 1,859 residents · 6.205 sq mi
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The short version

Seneca has roughly average household income, with a median household income of $31,549. Population has declined 9% since 2000. 11% of adults hold a bachelor's degree or higher, below the national rate of 20%. Median home value is $55,300.

At a glance
Average income
near the US median
US median: $30,130
Mid-age
median age 33.0
US median: 33.0
Less educated
11% hold a bachelor's degree
US average: 20%
More affordable
home values down 31%, inflation adjusted
US median home: $93,722
Section 01

Population & growth

1,859
−9%vs 2000
vs 2,053 in 2000
1990 – 2025
300 / sq mi
−9%vs 2000
vs 331 / sq mi in 2000
US average: 221
33.0
−7%vs 2000
vs 35.7 in 2000
US average: 33.0
Population, 19902024
2K2K2K2K3K1990201020202024Seneca
20242K
1990201020202024
Section 02

Income & economy

$31,549
−20%inflation adjusted, since 2000
vs $52,188 in 2000
US average: $30,130
1990 – 2024
$12,769
−34%vs 2000
vs $19,273 in 2000
US average: $14,340
6.8%
−0.5 ptsvs 2000
vs 7.3% in 2000
US average: 13.2%
Section 03

Housing

$55,300
−31%inflation adjusted, since 2000
vs $105,100 in 2000
US average: $93,722
1990 – 2024
$355
−7%inflation adjusted, since 2000
vs $505 in 2000
US average: $450
80.0%
−1.6 ptsvs 2000
vs 81.6% in 2000
20.0% rent
1.8
−13%vs 2000
vs 2.0 in 2000
1990 – 2024
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)
1990
White, non-Hispanic98.7%(1,835)
Black0%(0)
Hispanic / Latino0%(0)
Asian0.6%(11)
Other0.7%(13)
Diversity Score3.2%(59)
3
−15%vs 2000
vs 4 in 2000
1990 – 2024
Section 05

Education

10.8%
−2.1 ptsvs 2000
vs 12.9% in 2000
US average: 20.3%
High school or higher
81.2%
−5.2 ptsvs 2000
vs 86.4% in 2000
US average: 75.2%
3.4%
−0.9 ptsvs 2000
vs 4.3% in 2000
US average: 7.1%
Section 06

Commute & transportation

21.5 min
+9%vs 2000
vs 19.8 min in 2000
US average: 21.9
Section 07

Work & employment

No data for the years selected.

Section 08

People & community

No data for the years selected.

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Frequently asked

How many people live in Seneca, Illinois?

Seneca, Illinois has about 1,859 residents according to the 1990 Census.

What is the median household income in Seneca, Illinois?

The typical household in Seneca, Illinois earns about $31,549 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 $55,300, and the typical rent is about $355 a month.

How educated are people in Seneca, Illinois?

About 10.8% 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 6.8% of people in Seneca, Illinois live below the federal poverty line.

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

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