Stillman Valley, Illinois Demographics & Population 2026

Population Overview

Stillman Valley is a small community located in Illinois, within Ogle County. The total population is 1,260. It ranks as the 636th most populous out of 1,445 Census-designated places in Illinois.

Age Demographics

The median age in Stillman Valley is 38.9 years. This is about the same as the state median of 39.0 years.

Economy, Income & Housing

The median household income in Stillman Valley is $87,833. This is 5% higher than the state median of $83,390. It is also 9% higher than the national median of $80,734. The poverty rate stands at 8.6%. This is 27% lower than the state poverty rate of 11.8%. The unemployment rate is 1.2%. This is 79% lower than the state rate of 5.8%. The median home value is $175,800. Housing costs are 33% lower than the state median of $263,300. With a home-value-to-income ratio of just 2.0x, Stillman Valley is one of the most affordable housing markets in the area. 85.1% of occupied housing units are owner-occupied. This homeownership rate is 27% higher than the state average of 67.1%.

Race & Ethnicity

Stillman Valley has a predominantly White (non-Hispanic) population, comprising 88.5% of all residents. Black or African American residents account for 5.5%. The White (non-Hispanic) population is significantly higher than the state average (88.5% vs 58.1%). The Black or African American population (5.5%) is well below the state average of 13.3%. The Hispanic or Latino population (2.3%) is well below the state average of 18.8%. The Asian population (0.6%) is well below the state average of 5.9%.

Education

29.3% of residents aged 25 and older hold a bachelor's degree or higher. This is 22% 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 Stillman Valley, 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.