Where does this demographic data come from?

All demographic data comes from the U.S. Census Bureau's American Community Survey (ACS) 5-Year Estimates, which samples about 3.5 million households annually. The 5-year estimates provide the most reliable data for small geographies like municipalities.

What is the difference between Census data and ACS data?

The decennial Census (conducted every 10 years) is a full population count focusing on basic demographics. The ACS is an ongoing survey that collects detailed data on income, education, housing, commute patterns, and more. ACS data is updated annually but represents averages over a 5-year period.

How accurate is this data for small towns?

For smaller municipalities, ACS estimates have wider margins of error because fewer residents are sampled. The 5-year estimates reduce this uncertainty by averaging over a longer period. For towns under 5,000 people, treat specific numbers as approximations rather than precise counts.

Seneca, IL Population, Income & Demographics 2026

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Demographics — 2024 ACS 5-Year Estimatesi

Census

Populationi

2,450

Median Agei

35.5

Race & Ethnicityi

White

86.6%2,121

Hispanic/Latino

10%246

Two or More

2.4%60

Black

0.9%22

American Indian/Alaska Native

0%1

Educational Attainment (Age 25+)i

GED/Alternative

3.6%57

High School Diploma

35.4%566

Some College (<1 yr)

6.4%103

Some College (1+ yr)

16.6%265

Associate's Degree

17%271

Bachelor's Degree

12.1%193

Master's Degree

2.4%38

Professional Degree

0.4%7

HS or Higher

93.9%

BA or Higher

14.9%

Graduate+

2.8%

Housingi

Median Home Valuei

$227,500

Median Renti

$1,149

Tenure

Owner-Occupied

81.3%737

Renter-Occupied

18.7%170

Total Units

968

Homeownership

81.3%

Vacancy Rate

6.3%

Home Values

Under $50K

7.9%58

$50K–$100K

2.2%16

$100K–$150K

10.4%77

$150K–$200K

21.2%156

$200K–$300K

26.5%195

$300K–$500K

31.3%231

$500K–$1M

0.5%4

Rent Distribution

Under $500

$500–$750

$750–$1,000

$1,000–$1,250

$1,250–$1,500

$1,500–$2,000

$2,000+

Year Built

2020 or later

2.4%23

2010–2019

1.5%15

2000–2009

21.6%209

1990–1999

15.4%149

1980–1989

2.6%25

1970–1979

16.9%164

1960–1969

15.1%146

1950–1959

6.7%65

1940–1949

5.1%49

1939 or earlier

12.7%123

Heating Fuel

Utility Gas

88%798

Electricity

8.2%74

Bottled/LP Gas

3.9%35

Economyi

Median Household Incomei

$86,830

Mean Household Incomei

$111,346

Per Capita Incomei

$41,006

Poverty Ratei

22.2%

Unemploymenti

Labor Forcei

1,052

Household Income Distribution

Under $10K

1.3%12

$15K–$20K

0.8%7

$20K–$25K

5.5%50

$25K–$30K

2.8%25

$30K–$35K

1.2%11

$35K–$40K

1.8%16

$40K–$45K

4.3%39

$45K–$50K

2.6%24

$50K–$60K

9.2%83

$60K–$75K

16.4%149

$75K–$100K

10%91

$100K–$125K

9.5%86

$125K–$150K

7.3%66

$150K–$200K

13.1%119

$200K+

14.2%129

Federally Subsidized Housingi

HUD

The federal government helps low-income families, seniors, and people with disabilities afford housing through several programs. Residents typically pay about 30% of their income toward rent, with the government covering the rest. This data shows how many households in this community receive that assistance.

Subsidized Homesi

Residentsi

Avg. Tenant Renti

$464/mo

Programs in this community

Public Housing12 homes97% occupied$464/mo rent

Government-owned housing managed by local housing authorities

Housing Choice Vouchers3 homes

Rental vouchers (Section 8) that help tenants pay for private-market housing

Household Incomei

Based on area median of $86,830/yr

Extremely low incomeUnder $26K/yr

58%

Very low income$26K–$43K/yr

25%

Low income$43K–$69K/yr

17%

Who Receives This Housing

83% of subsidized households are headed by a single mother

8% of subsidized households are minority

3% of subsidized households include someone with a disability

17% of subsidized households include a senior (62+)

Ancestry & Heritage

Self-reported ancestry groups. Residents may report multiple ancestries, so totals may exceed 100%.

Foreign-Born Populationi

Foreign-Borni

502%

By Region

Top Countries

Mexico

Commute & Transportationi

Workersi

974

Avg. Commutei

26.2 min

How People Get to Work

Travel Time to Work

Workforce

Total Employed

1,010

Occupations

Industries

Social Characteristicsi

Marital Status (15+)i

Veteransi

196(11.2% of civilian adults)

Health Insurancei

95.2%Insured

4.8%Uninsured