Kaskaskia, Illinois Demographics & Population 2026

A note before these figures: with a population of 38, Kaskaskia's ACS estimates come from a small number of survey responses and carry wide margins of error. Individual percentages below — particularly rates that round to 0% or 100% — are approximations, not precise measurements. See data.census.gov for the published margins of error.

Population Overview

Kaskaskia is a small community located in Illinois, within Randolph County. The total population is 38. It ranks as the 1416th most populous out of 1,445 Census-designated places in Illinois.

Age Demographics

The median age in Kaskaskia is 16.0 years. This is 59% lower than the state median of 39.0 years. With 52.6% of the population under 18, Kaskaskia has a notably young demographic profile, suggesting a family-oriented community. 10.5% of residents are 75 or older, suggesting a significant retirement-age population with implications for healthcare services and senior housing.

Economy, Income & Housing

The median household income in Kaskaskia is $150,313. This is 80% higher than the state median of $83,390. It is also 86% higher than the national median of $80,734. The ACS records no residents below the poverty line in Kaskaskia. In a community this small the estimate rests on very few survey responses, so it should be read as an absence of measurement rather than a measured absence of poverty. The survey records no unemployed residents in Kaskaskia, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $145,800. Housing costs are 45% lower than the state median of $263,300. With a home-value-to-income ratio of just 1.0x, Kaskaskia is one of the most affordable housing markets in the area. 100.0% of occupied housing units are owner-occupied. This homeownership rate is 49% higher than the state average of 67.1%.

Race & Ethnicity

Kaskaskia has a predominantly White (non-Hispanic) population, comprising 92.1% of all residents. Asian residents account for 7.9%. The White (non-Hispanic) population is significantly higher than the state average (92.1% vs 58.1%).

Education

22.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 41% lower than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. No surveyed resident aged 25 or older reported leaving school before earning a high school diploma, though a rate of exactly 100% reflects the limits of a small sample.

Data Sources & Methodology

All demographic data for Kaskaskia, Illinois is sourced from the U.S. Census Bureau's American Community Survey (ACS) 2020–2024 5-Year Estimates. The ACS collects data from approximately 3.5 million households annually and pools five years of responses so that even small communities can be measured, though the margin of error widens as the population falls. Comparisons are made against Illinois state averages and national averages calculated from the same dataset. Rankings reflect the city's position among all 1,445 Census-designated places in Illinois. Read more about how these figures are produced on our methodology page, or visit data.census.gov for official data.