Wilmington, Illinois Demographics & Population 2026

A note before these figures: with a population of 92, Wilmington'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

Wilmington is a small community located in Illinois, within Greene County. The total population is 92. It ranks as the 1343rd most populous out of 1,445 Census-designated places in Illinois.

Age Demographics

The median age in Wilmington is 46.2 years. This is 18% higher than the state median of 39.0 years. Only 10.9% of residents are under 18, indicating fewer families with children.

Economy, Income & Housing

The median household income in Wilmington is $74,167. This is 11% lower than the state median of $83,390. It is also 8% lower than the national median of $80,734. The poverty rate stands at 31.5%. This is 167% higher than the state poverty rate of 11.8%. With more than one in five residents living below the poverty line, economic hardship is a significant challenge for the community. The survey records no unemployed residents in Wilmington, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $34,500. Housing costs are 87% lower than the state median of $263,300. With a home-value-to-income ratio of just 0.5x, Wilmington is one of the most affordable housing markets in the area. 90.6% of occupied housing units are owner-occupied. This homeownership rate is 35% higher than the state average of 67.1%.

Race & Ethnicity

Wilmington has a predominantly White (non-Hispanic) population, comprising 89.1% of all residents. The White (non-Hispanic) population is significantly higher than the state average (89.1% vs 58.1%).

Education

7.1% of residents aged 25 and older hold a bachelor's degree or higher. This is 81% lower than the state rate of 37.9%. Nationally, 35.7% of adults hold at least a bachelor's degree. The high school graduation rate (or equivalent) is 74.3%.

Data Sources & Methodology

All demographic data for Wilmington, 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.