Marseilles vs Seneca

A side-by-side comparison of Marseilles and Seneca: population, income, housing, and more.

Marseilles and Seneca are places in Illinois. This page compares them across population, income, housing, education, commuting, and how each has changed since 2019.

Marseilles has the higher population (4,071 vs 2,525 in Seneca). Seneca has the higher median household income ($91,065 vs $56,777 in Marseilles). Seneca has the higher median home value ($206,400 vs $119,100 in Marseilles).

Population, income & housing

	Marseilles	Seneca
Population	4,071	2,525
Median age	41.0 yrs	35.2 yrs
Median household income	$56,777	$91,065
Median home value	$119,100	$206,400
Median gross rent	$1,039	$988
Housing units	2,119	971
Homeownership rate	64.6%	76.6%
Bachelor's degree or higher	21.2%	12.9%
Unemployment rate	5.9%	4.2%

Trends (ACS 5-year, 2019–2023)

	Marseilles	Seneca
Population	5,032 → 4,071 (-19.1%)	2,442 → 2,525 (+3.4%)
Median household income	$58,750 → $56,777 (-3.4%)	$72,273 → $91,065 (+26.0%)
Median home value	$108,400 → $119,100 (+9.9%)	$161,000 → $206,400 (+28.2%)
Median gross rent	$949 → $1,039 (+9.5%)	$741 → $988 (+33.3%)

Marseilles

Population

5,0324,071

Median household income

$58,750$56,777

Median home value

$108,400$119,100

Median gross rent

$949$1,039

Seneca

Population

2,4422,525

Median household income

$72,273$91,065

Median home value

$161,000$206,400

Median gross rent

$741$988

Age & race/ethnicity

Age distribution (share)

	Marseilles	Seneca
Under 5	5.2%	8.4%
5 to 17	18.9%	19.4%
18 to 24	7.1%	7.0%
25 to 34	10.1%	15.0%
35 to 44	16.8%	6.4%
45 to 54	13.6%	12.1%
55 to 64	10.6%	20.8%
65 to 74	10.8%	7.0%
75 and over	6.9%	3.8%

Race & ethnicity (share)

	Marseilles	Seneca
White (non-Hispanic)	89.0%	88.7%
Black or African American	0.0%	1.1%
American Indian & Alaska Native	0.0%	0.0%
Asian	3.0%	0.0%
Native Hawaiian & Pacific Islander	0.0%	0.0%
Some other race	0.0%	0.0%
Two or more races	2.5%	4.2%
Hispanic or Latino	5.5%	6.0%

Educational attainment (age 25+)

Share of adults 25+

	Marseilles	Seneca
No high school diploma	5.6%	5.3%
High school graduate	44.3%	40.8%
Some college or associate's	28.9%	41.0%
Bachelor's degree	12.0%	10.5%
Graduate or professional degree	9.2%	2.4%

Commute to work

How workers get to work (share)

	Marseilles	Seneca
Drove alone	83.2%	77.5%
Carpooled	4.4%	10.4%
Public transit	0.3%	0.0%
Walked	0.8%	5.1%
Bicycle	0.5%	0.0%
Worked from home	10.5%	6.3%
Other means	0.4%	0.7%

Housing

Units in structure (share)

	Marseilles	Seneca
1-unit, detached	63.9%	77.8%
1-unit, attached	5.3%	4.3%
2 to 4 units	8.4%	8.4%
5 to 19 units	8.4%	2.8%
20 or more units	2.4%	0.0%
Mobile home & other	11.5%	6.7%

Poverty & households

	Marseilles	Seneca
Poverty rate	16.6%	19.4%
Average household size	2.35	2.72
Mean commute (minutes)	26	30
Median year structure built	1963	1975