Arrowsmith, Illinois Demographics & Population 2026

A note before these figures: with a population of 320, Arrowsmith'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

Arrowsmith is a small community located in Illinois, within McLean County. The total population is 320. It ranks as the 1062nd most populous out of 1,445 Census-designated places in Illinois.

Age Demographics

The median age in Arrowsmith is 36.0 years. This is 8% lower than the state median of 39.0 years. With 28.4% of the population under 18, Arrowsmith has a notably young demographic profile, suggesting a family-oriented community.

Economy, Income & Housing

The median household income in Arrowsmith is $88,594. This is 6% higher than the state median of $83,390. It is also 10% higher than the national median of $80,734. The poverty rate stands at 31.6%. This is 168% 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 unemployment rate is 5.8%. The median home value is $103,500. Housing costs are 61% lower than the state median of $263,300. With a home-value-to-income ratio of just 1.2x, Arrowsmith is one of the most affordable housing markets in the area. 87.5% of occupied housing units are owner-occupied. This homeownership rate is 30% higher than the state average of 67.1%.

Race & Ethnicity

The largest racial or ethnic group in Arrowsmith is White (non-Hispanic), making up 81.3% of the population. Black or African American residents account for 12.8%. The Hispanic or Latino population (4.4%) is well below the state average of 18.8%.

Education

26.2% of residents aged 25 and older hold a bachelor's degree or higher. This is 31% 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 98.1%.

Data Sources & Methodology

All demographic data for Arrowsmith, 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.