Seneca demographics profile

StatisticSenecaIllinoisNational
Population2,56512,851,684318,558,162
Population density (sq mi)39122291
Median age38.837.437.7
Male/Female ratio1.4:11.0:11.0:1
Married (15yrs & older)50%55%55%
Families w/ Kids under 1839%44%43%
Speak English99%77%79%
Speak Spanish1%13%13%
Seneca, IL has a population of 2,565 and is the 9,689th largest city in the United States. The population density is 391 per sq mi which is 76% higher than the Illinois average and 331% higher than the national average. The median age in Seneca is 39 which is approximately 4% higher than the Illinois average of 37. In Seneca, 50% of the population over 15 years of age are married, 99% speak English and 1% speak Spanish. 84% of Seneca residents were born in Illinois, 16% were born out of state, 0% were born outside of the United States and 0% were foreign born.

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Did you know?

  • The population density in Seneca is 76% higher than Illinois.
  • The median age in Seneca is 4% higher than Illinois.
  • In Seneca 98.83% of the population is White.
  • In Seneca 0.00% of the population is Black or African American.
  • In Seneca 0.55% of the population is Asian.

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Seneca population breakdown by race

RaceSenecaIllinoisNational
White98.83%72.14%73.35%
Black or African American0.00%14.30%12.63%
Asian0.55%5.10%5.22%
American Indian0.19%0.23%0.82%
Native Hawaiian0.00%0.03%0.18%
Mixed race0.43%2.34%3.06%
Other race0.00%5.86%4.75%
In Seneca, 4.4% of people are of Hispanic or Latino origin.
Please note: Hispanics may be of any race, so also are included in any/all of the applicable race categories above.

Languages spoken

Place of birth by citizenship

Household income distribution

Source of income

Seneca age breakdown

Marital status

Age of children in married couples

Source: The Seneca, IL demographics data displayed above is derived from the 2016 United States Census Bureau American Community Survey (ACS).
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