Seneca, Illinois Population 2022

2,349
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Seneca is a city located in Illinois. With a 2020 population of 2,349, it is the 469th largest city in Illinois and the 10086th largest city in the United States. Seneca is currently declining at a rate of -0.09% annually and its population has decreased by -7.30% since the most recent census, which recorded a population of 2,534 in 2020. Spanning over 7 miles, Seneca has a population density of 362 people per square mile.

The average household income in Seneca is $85,150 with a poverty rate of 15.23%. The median rental costs in recent years comes to $794 per month, and the median house value is $169,200. The median age in Seneca is 32.6 years, 35.5 years for males, and 30.7 years for females.

Seneca Demographics

According to the most recent ACS, the racial composition of Senecawas:

  • White: 96.80%
  • Two or more races: 2.45%
  • Black or African American: 0.67%
  • Other race: 0.08%
  • Native American: 0.00%
  • Asian: 0.00%
  • Native Hawaiian or Pacific Islander: 0.00%
The current population of Seneca, Illinois is 2,349 based on our projections of the latest US Census estimates.The last official US Census in 2020 recorded the population at 2,534.

Seneca, Illinois Population 2022

Population by Race

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Seneca Population by Race

Seneca Population Pyramid 2022

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Seneca Median Age

34.8


Total

34.9


Male

34.5


Female

Seneca Adults

There are 1,868 adults, (301 of whom are seniors) in Seneca.

Seneca Age Dependency

Age Dependency Ratio

19.2

Old Age Dependency Ratio

42.5

Child Dependency Ratio

Seneca Sex Ratio

Female

1,297

51.18%

Male

1,237

48.82%

Seneca Population by Age

Seneca Renter vs Owner Occupied by Household Type

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Seneca Household Types

83.8%

Rate of Home Ownership

Seneca Households and Families

2.85

Average Family Size

2.67

Average Household Size

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Seneca Households by Type

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Seneca Educational Attainment by Sex (over 25)

Seneca Educational Attainment by Race

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The highest rate of high school graduation is among black people with a rate of 100.00%.

The highest rate of bachelors degrees is among white people with a rate of 15.87%.

Seneca Educational Attainment by Race

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$41,326

Average Earnings

$64,803

Average Male

$24,500

Average Female

Seneca Earnings by Educational Attainment

Seneca Language by Age

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Seneca Language

99.44% of Seneca residents speak only English, while 0.56% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 0.56% of the population.

Seneca Language

Seneca Poverty by Race

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15.23%

Overall Poverty Rate

13.18%

Male Poverty Rate

17.19%

Female Poverty Rate

Poverty in Seneca

The race most likely to be in poverty in Seneca is White, with 14.79% below the poverty level.

The race least likely to be in poverty in Seneca is Hispanic, with 5.94% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 5.76%. Among those working part-time, it was 21.79%, and for those that did not work, the poverty rate was 9.53%.

Seneca Poverty

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Seneca Poverty Rate by Education

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Seneca Poverty Rate by Employment Status and Sex

Seneca Income by Household Type

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Income by Household Type

Seneca Marital Status

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Marriage Rates

47.8%

Overall Marriage Rate

50.3%

Male Marriage Rate

45.5%

Female Marriage Rate

Seneca Married by Age and Sex

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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

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Seneca Marital Status

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172

Number of Veterans

Male Veterans

Female Veterans

Seneca Veterans by War

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Seneca Veterans by Age

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Seneca Veterans by Race

Seneca Veterans by Education

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2.91%

Veteran Poverty Rate

17.44%

Veteran Disability Rate

Seneca Veterans by Education

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69.2%

Labor Force Participation

64.5%

Employment Rate

6.7%

Unemployment Rate

Seneca Employment by Age

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Seneca Employment by Race

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Seneca Employment by Education

Origin of Non-Citizens

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

Origin of Naturalized Citizens

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85.87%

Born in Seneca

99.80%

Native Born

0.20%

Foreign Born

0.00%

Non Citizen

0.20%

Naturalized

Place of Birth

99.80% of Seneca residents were born in the United States, with 85.87% having been born in Illinois. 0.00% 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: 2021 and 2022 data is projected

Seneca Population by Year