Twin Grove, Illinois Demographics & Population 2026

Population Overview

Twin Grove is a small community located in Illinois, within McLean County. The total population is 1,458. It ranks as the 593rd most populous out of 1,445 Census-designated places in Illinois.

Age Demographics

The median age in Twin Grove is 49.4 years. This is 27% higher than the state median of 39.0 years.

Economy, Income & Housing

The median household income in Twin Grove is $116,250. This is 39% higher than the state median of $83,390. It is also 44% higher than the national median of $80,734. The poverty rate stands at 4.2%. This is 64% lower than the state poverty rate of 11.8%. This exceptionally low poverty rate indicates strong economic prosperity across the community. The survey records no unemployed residents in Twin Grove, which reflects the size of the sample rather than a labor market without joblessness. The median home value is $264,800. Housing costs are about the same as the state median of $263,300. With a home-value-to-income ratio of just 2.3x, Twin Grove is one of the most affordable housing markets in the area. 97.1% of occupied housing units are owner-occupied. This homeownership rate is 45% higher than the state average of 67.1%.

Race & Ethnicity

Twin Grove has a predominantly White (non-Hispanic) population, comprising 89.2% of all residents. Hispanic or Latino residents account for 3.4%. The White (non-Hispanic) population is significantly higher than the state average (89.2% vs 58.1%). The Black or African American population (2.1%) is well below the state average of 13.3%. The Hispanic or Latino population (3.4%) is well below the state average of 18.8%. The Asian population (0.5%) is well below the state average of 5.9%.

Education

59.7% of residents aged 25 and older hold a bachelor's degree or higher. This places Twin Grove in the top 10% of all cities in the state for educational attainment. This is 58% higher 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 98.2%. Notably, 23.8% of adults hold a graduate or professional degree, indicating a highly educated workforce.

Data Sources & Methodology

All demographic data for Twin Grove, 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.