State
Land Area (mi²)
35.9 sq mi
Density (mi²)
79.80/sq mi
2020 Growth Rate
-0.24%
Growth Since 2010
-2.35%
World Population Review
Seneca, Illinois Population 2021
2,863
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
| Race | Population | Percentage |
|---|---|---|
| White | 2,677 | 92.63% |
| Two or More Races | 127 | 4.39% |
| Asian | 66 | 2.28% |
| Black or African American | 20 | 0.69% |
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Seneca Population by Race
Seneca Population Pyramid $2021
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Seneca Population by Age
Seneca Households and Families
| Type | Count | Average Size | Owned |
|---|---|---|---|
| All | 1,108 | 2.57 | 90.2 |
| Married | 946 | 2.71 | 93.1 |
| Female | 84 | 2.45 | 100 |
| Non Family | 78 | 0 | 43.6 |
| Male | 0 | 0 |
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 Grade | 66 | 2.83% |
| 9th to 12th Grade | 0.00% | |
| High School Graduate | 549 | 23.57% |
| Some College | 400 | 17.17% |
| Associates Degree | 287 | 12.32% |
| Bachelors Degree | 543 | 23.31% |
| Graduate Degree | 484 | 20.78% |
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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 |
|---|---|---|---|
| White | 2,214 | 2,148 | 989 |
| Hispanic | 73 | 73 | 38 |
| 2+ Races | 42 | 42 |
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
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
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
Seneca Poverty Rate by Education
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
Seneca Veterans by War
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| Name | Veterans | % of Total |
|---|---|---|
| White | 239 | 10.13% |
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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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 |
|---|---|---|---|
| 2021 | 2,863 | -7 | -0.24% |
| 2020 | 2,870 | -7 | -0.24% |
| 2019 | 2,877 | -7 | -0.24% |
| 2018 | 2,884 | -1 | -0.03% |
| 2017 | 2,885 | 2 | 0.07% |
| 2016 | 2,883 | -14 | -0.48% |
| 2015 | 2,897 | -5 | -0.17% |
| 2014 | 2,902 | -6 | -0.21% |
| 2013 | 2,908 | -15 | -0.51% |
| 2012 | 2,923 | -5 | -0.17% |
| 2011 | 2,928 | -4 | -0.14% |
| 2010 | 2,932 | 0.00% |