Seneca, Illinois Population 2024

2,256

Seneca is a city located in LaSalle County Illinois. Seneca has a 2024 population of 2,256. Seneca is currently declining at a rate of -1.14% annually and its population has decreased by -3.67% since the most recent census, which recorded a population of 2,342 in 2020.

The average household income in Seneca is $109,004 with a poverty rate of 17.54%. The median rental costs in recent years comes to - per month, and the median house value is -. The median age in Seneca is 35 years, 34.5 years for males, and 36.5 years for females.

Seneca Demographics

According to the most recent ACS, the racial composition of Seneca was:

  • White: 92.09%
  • Two or more races: 5.19%
  • Other race: 1.72%
  • Black or African American: 1.01%
  • Native American:
  • Asian:
  • Native Hawaiian or Pacific Islander:
Land Area (mi²)
6.5 sq mi
Density (mi²)
347.20/sq mi
Growth Since 2020
-3.67% (-86)
The current population of Seneca, Illinois is 2,256 based on our projections of the latest US Census estimates.The last official US Census in 2020 recorded the population at 2,342.

Seneca, Illinois Population 2024

Population by Race

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Race
Population
Percentage (of total)
White2,36292.09%
Two or more races1335.19%
Other race441.72%
Black or African American261.01%
Native American
Asian
Native Hawaiian or Pacific Islander
showing: 7 rows

White

Two or more races

Other race

Black or African American

Native American

Asian

Native Hawaiian or Pacific Islander

Seneca Population by Race

Seneca Population Pyramid 2024

Seneca Median Age

35

Total

34.5

Male

36.5

Female

Seneca Adults

There are 1,887 adults, (276 of whom are seniors) in Seneca.

Seneca Age Dependency

59.2

Age Dependency Ratio

17.1

Old Age Dependency Ratio

42.1

Child Dependency Ratio

Seneca Sex Ratio

Female1,23448.11%
Male1,33151.89%

Seneca Population by Age

Seneca Renter vs Owner Occupied by Household Type

Household Type
Count
Average Size
Owner
Renter
All9472.7180.119.9
Married4763.13928
Non Family2301.3774.825.2
Female1513.357.642.4
Male902.8968.931.1
showing: 5 rows

3.03

Average Family Size

2.71

Average Household Size

80.1%

Rate of Home Ownership

Married

Male

Female

NonFamily

owner

renter

Seneca Households and Families

Male

Female

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Less Than 9th Grade

9th to 12th Grade

High School Graduate

Some College

Associates Degree

Bachelors Degree

Graduate Degree

Seneca Educational Attainment by Sex (over 25)

Seneca Educational Attainment by Race

High School Graduation Rate

Bachelors Rate

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The highest rate of high school graduation is among black people with a rate of 100%.

The highest rate of bachelors degrees is among other race people with a rate of 95.45%.

Seneca Educational Attainment by Race

All

Male

Female

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$50,530

Average Earnings

$71,713

Average Male

$30,284

Average Female

Seneca Earnings by Educational Attainment

Seneca Language by Age

Only English

Spanish

Other Indo-European Languages

Asian and Pacific Island Languages

Other Languages

Seneca Language

98.13% of Seneca residents speak only English, while 1.87% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 1.87% of the population.

Seneca Language

Seneca Poverty by Race

rate

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Name
Total
In Poverty
Poverty Rate
White2,33138216.39%
Multiple1336851.13%
Hispanic1393021.58%
showing: 3 rows

17.54%

Overall Poverty Rate

13.9%

Male Poverty Rate

21.47%

Female Poverty Rate

Poverty in Seneca

The race most likely to be in poverty in Seneca is Multiple, with 51.13% below the poverty level.

The race least likely to be in poverty in Seneca is White, with 16.39% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 5.47%. Among those working part-time, it was 22.35%, and for those that did not work, the poverty rate was 8.44%.

Seneca Poverty

rate

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Rate
Poverty
High School20.83%
Less Than 9th Grade15.24%
Some College3.36%
Bachelors or Greater
showing: 4 rows

Seneca Poverty Rate by Education

rate

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Rate
Poverty
Female Employed21.18%
Male Employed4.26%
Male Unemployed
Female Unemployed
showing: 4 rows

Seneca Poverty Rate by Employment Status and Sex

Seneca Income by Household Type

Households

Families

MarriedFamilies

NonFamilies

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mean

median

Income by Household Type

Seneca Marital Status

Married

Widowed

Divorced

Separated

NeverMarried

Marriage Rates

48.1%

Overall Marriage Rate

45.5%

Male Marriage Rate

51.0%

Female Marriage Rate

Seneca Married by Age and Sex

male

female

Seneca Marriage

The age group where males are most likely to be married is Over 65, while the female age group most likely to be married is 55-64.

Seneca Marital Status by Race

Married

Widowed

Divorced

Separated

NeverMarried

Seneca Marital Status

Second Gulf War

First Gulf War

Vietnam

Korea

World War II

205

Number of Veterans

198

Male Veterans

7

Female Veterans

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Seneca Veterans by War

count

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Seneca Veterans by Age

count

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Seneca Veterans by Race

Seneca Veterans by Education

Less Than 9th Grade

High School Graduate

Some College

Bachelors or Greater

2.93%

Veteran Poverty Rate

23.41%

Veteran Disability Rate

Seneca Veterans by Education

LaborForceParticipation

61.1%

Labor Force Participation

58.8%

Employment Rate

3.8%

Unemployment Rate

Seneca Employment by Age

LaborForceParticipation

Seneca Employment by Race

LaborForceParticipation

Seneca Employment by Education

Origin of Non-Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

Non citizens include legal permanent residents (green card holders), international students, temporary workers, humanitarian migrants, and illegal immigrants.

Origin of Naturalized Citizens

Europe

Asia

Africa

Oceania

Latin America

North America

80.86%

Born in Seneca

98.4%

Native Born

1.6%

Foreign Born

Non Citizen

1.6%

Naturalized

Place of Birth

98.4% of Seneca residents were born in the United States, with 80.86% having been born in Illinois. of residents are not US citizens. Of those not born in the United States, the largest percentage are from Latin America.

Seneca Place of Birth

Note: data after 2022 is projected based on recent change

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Year
Population
Growth
Growth Rate
20292,126-26-1.21%
20282,152-26-1.19%
20272,178-26-1.18%
20262,204-26-1.17%
20252,230-26-1.15%
20242,256-26-1.14%
20232,282-26-1.13%
20222,308-26-1.11%
20212,334-8-0.34%
20202,3421014.51%
20192,241-2-0.09%
20182,243-7-0.31%
20172,250-11-0.49%
20162,261-12-0.53%
20152,273-13-0.57%
20142,286-16-0.7%
20132,302-20-0.86%
20122,322-20-0.85%
20112,342-10-0.43%
20102,352
showing: 20 rows

Seneca Population by Year