Seneca, Illinois Population 2021

2,863
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Seneca is a city located in Illinois. Seneca has a 2020 population of 2,863. Seneca is currently declining at a rate of -0.24% annually and its population has decreased by -2.35% since the most recent census, which recorded a population of 2,932 in 2010. Seneca reached it's highest population of 2,932 in 2010.

The average household income in Seneca is $142,262 with a poverty rate of 1.19%. The median rental costs in recent years comes to $1,085 per month, and the median house value is $287,900. The median age in Seneca is 53.8 years, 54 years for males, and 53.7 years for females.

Seneca Demographics

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

  • White: 92.63%
  • Two or more races: 4.39%
  • Asian: 2.28%
  • Black or African American: 0.69%
  • Native American: 0.00%
  • Native Hawaiian or Pacific Islander: 0.00%
  • Other race: 0.00%
The current population of Seneca, Illinois is 2,863 based on our projections of the latest US Census estimates. The US Census estimates the 2018 population at 2,884.The last official US Census in 2010 recorded the population at 2,932.

Seneca, Illinois Population 2021

Population by Race

Race Population Percentage
White2,67792.63%
Two or More Races1274.39%
Asian662.28%
Black or African American200.69%
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Seneca Population by Race

Seneca Population Pyramid $2021

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Seneca Median Age

53.8


Total

54


Male

53.7


Female

Seneca Adults

There are 2,401 adults, (775 of whom are seniors) in Seneca.

Seneca Age Dependency

77.7

Age Dependency Ratio

47.7

Old Age Dependency Ratio

30.1

Child Dependency Ratio

Seneca Sex Ratio

Female

1,499

51.87%

Male

1,391

48.13%

Seneca Population by Age

Seneca Renter vs Owner Occupied by Household Type

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Seneca Household Types

Type Owner Renter
Female100%0%
Married93.1%6.9%
All90.2%9.8%
Non Family43.6%56.4%
Male0%0%

90.2%

Rate of Home Ownership

Seneca Households and Families

Type Count Average Size Owned
All1,1082.5790.2
Married9462.7193.1
Female842.45100
Non Family78043.6
Male00

2.66

Average Family Size

2.57

Average Household Size

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Seneca Households by Type

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Education Attained Count Percentage
Less Than 9th Grade662.83%
9th to 12th Grade0.00%
High School Graduate54923.57%
Some College40017.17%
Associates Degree28712.32%
Bachelors Degree54323.31%
Graduate Degree48420.78%
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Seneca Educational Attainment by Sex (over 25)

Seneca Educational Attainment by Race

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Race Total High School Bachelors
White2,2142,148989
Hispanic737338
2+ Races4242

The highest rate of high school graduation is among 2+ races people with a rate of 100.00%.

The highest rate of bachelors degrees is among hispanic people with a rate of 52.05%.

Seneca Educational Attainment by Race

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Name Average Male Female
Overall$50,282$71,484$48,237
Less Than 9th Grade$$$
High School Graduate$39,455$71,797$29,750
Some College$51,000$46,288$52,661
Bachelors Degree$$$49,890
Graduate Degree$$128,292$36,086

$50,282

Average Earnings

$71,484

Average Male

$48,237

Average Female

Seneca Earnings by Educational Attainment

Seneca Language by Age

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Seneca Language

95.14% of Seneca residents speak only English, while 4.86% speak other languages. The non-English language spoken by the largest group is Spanish, which is spoken by 2.65% of the population.

Seneca Language

Seneca Poverty by Race

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1.19%

Overall Poverty Rate

0.00%

Male Poverty Rate

2.30%

Female Poverty Rate

Poverty in Seneca

The race most likely to be in poverty in Seneca is White, with 1.31% below the poverty level.

The race least likely to be in poverty in Seneca is White, with 1.31% below the poverty level.

The poverty rate among those that worked full-time for the past 12 months was 0.00%. Among those working part-time, it was 0.00%, and for those that did not work, the poverty rate was 5.28%.

Seneca Poverty

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Name Poverty
Some College4.95%
Bachelors or Greater0.00%
High School0.00%
Less Than 9th Grade0.00%

Seneca Poverty Rate by Education

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Rate Poverty
Female Unemployed0.00%
Female Employed0.00%
Male Unemployed0.00%
Male Employed0.00%

Seneca Poverty Rate by Employment Status and Sex

Seneca Income by Household Type

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Name Median Mean
Households$147,663$142,262
Families$149,783$151,015
Married Families$153,068-
Non Families--
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Income by Household Type

Seneca Marital Status

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Marriage Rates

82.1%

Overall Marriage Rate

80.0%

Male Marriage Rate

84.3%

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 55-64, while the female age group most likely to be married is 45-54.

Seneca Marital Status by Race

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Seneca Marital Status

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239

Number of Veterans

239

Male Veterans

Female Veterans

War Veterans
Vietnam119
World War II
Korea
First Gulf War
Second Gulf War

Seneca Veterans by War

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Age Group Veterans
65 to 74148
55 to 6459
75+32
35 to 54
18 to 34

Seneca Veterans by Age

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Seneca Veterans by Race

Seneca Veterans by Education

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0.00%

Veteran Poverty Rate

12.13%

Veteran Disability Rate

Seneca Veterans by Education

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69.1%

Labor Force Participation

67.9%

Employment Rate

1.7%

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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71.45%

Born in Seneca

96.47%

Native Born

3.53%

Foreign Born

1.25%

Non Citizen

2.28%

Naturalized

Place of Birth

96.47% of Seneca residents were born in the United States, with 71.45% having been born in Illinois. 1.25% of residents are not US citizens. Of those not born in the United States, the largest percentage are from Asia.

Seneca Place of Birth

Year Population Growth Annual Growth Rate
20212,863-7-0.24%
20202,870-7-0.24%
20192,877-7-0.24%
20182,884-1-0.03%
20172,88520.07%
20162,883-14-0.48%
20152,897-5-0.17%
20142,902-6-0.21%
20132,908-15-0.51%
20122,923-5-0.17%
20112,928-4-0.14%
20102,9320.00%

Seneca Population by Year