North Henderson, Illinois Demographics & Population 2026

A note before these figures: with a population of 191, North Henderson'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

North Henderson is a small community located in Illinois, within Mercer County. The total population is 191. It ranks as the 1218th most populous out of 1,445 Census-designated places in Illinois.

Age Demographics

The median age in North Henderson is 34.8 years. This is 11% lower than the state median of 39.0 years.

Economy, Income & Housing

The median household income in North Henderson is $74,231. This is 11% lower than the state median of $83,390. It is also 8% lower than the national median of $80,734. The ACS records no residents below the poverty line in North Henderson. 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 unemployment rate is 2.7%. This is 53% lower than the state rate of 5.8%. The median home value is $66,700. Housing costs are 75% lower than the state median of $263,300. With a home-value-to-income ratio of just 0.9x, North Henderson 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

Every resident counted in North Henderson was recorded as White (non-Hispanic). A figure of exactly 99.5% reflects a survey sample too small to capture the community's full composition rather than a precise measurement.

Education

13.6% of residents aged 25 and older hold a bachelor's degree or higher. This is 64% 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 93.2%.

Data Sources & Methodology

All demographic data for North Henderson, 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.