Simpson, Illinois Demographics & Population 2026

A note before these figures: with a population of 40, Simpson'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

Simpson is a small community located in Illinois, within Johnson County. The total population is 40. It ranks as the 1411th most populous out of 1,445 Census-designated places in Illinois.

Age Demographics

The median age in Simpson is 48.7 years. This is 25% higher than the state median of 39.0 years.

Economy, Income & Housing

The median household income in Simpson is $36,250. This is 57% lower than the state median of $83,390. It is also 55% lower than the national median of $80,734. The poverty rate stands at 32.5%. This is 175% 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 Simpson, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $84,000. Housing costs are 68% lower than the state median of $263,300. With a home-value-to-income ratio of just 2.3x, Simpson is one of the most affordable housing markets in the area. 93.3% of occupied housing units are owner-occupied. This homeownership rate is 39% higher than the state average of 67.1%.

Race & Ethnicity

Simpson has a predominantly White (non-Hispanic) population, comprising 92.5% of all residents. Hispanic or Latino residents account for 7.5%. The White (non-Hispanic) population is significantly higher than the state average (92.5% vs 58.1%). The Hispanic or Latino population (7.5%) is well below the state average of 18.8%.

Education

20.0% of residents aged 25 and older hold a bachelor's degree or higher. This is 47% 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 Simpson, 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.