Tool
Compare places
Put up to four U.S. cities, towns or census-designated places side by side on 29 figures: 22 measures from the ACS 2020-2024 5-year estimates, each with its margin, and their 2025 population estimate, growth, density, new homes and housing costs against income. A filled square marks a figure that differs from the first place by more than both margins of error allow; without it, the survey cannot tell the two apart.
How do St. Mary, IL compare?
| Figure | St. Mary, IL |
|---|---|
| Residents, July 2025 (estimate) | 532 |
| Change since April 2020 | −5.0% |
| Residents counted in the 2020 Census | 568 |
| Residents per square mile (2020) | 15 |
| Homes permitted in 2025 per 1,000 residents | – |
| Median home value ÷ median household income | 1.2 years of income |
| A year of median rent ÷ median income of all households (renters usually earn less) | 16.4% |
| Measure | St. Mary, IL |
|---|---|
| Total population | 646±150 |
| Median age | 54.4±6.1 |
| Hispanic or Latino (any race) | 3.1%±2.9 pts |
| White alone, not Hispanic | 95.0%±4.0 pts |
| Black or African American alone, not Hispanic | 1.5%±2.6 pts |
| Asian alone, not Hispanic | 0.0%±5.6 pts |
| Born outside the United States | 0.0%±5.6 pts |
| Bachelor's degree or higher (age 25+) | 9.4%±4.4 pts |
| Median household income | $56,429±$9,368 |
| Per capita income | $32,893±$6,550 |
| People below the poverty line | 16.9%±7.9 pts |
| Unemployment rate | 9.4%±7.7 pts |
| Median home value (owner-occupied) | $65,200±$10,492 |
| Median gross rent | $769±$123 |
| Renters paying 35% or more of income on rent | 50.0%±35.7 pts |
| Owner-occupied homes | 92.6%±5.4 pts |
| Built 2020 or later | 0.6%±1.1 pts |
| Worked from home | 12.9%±6.1 pts |
| Drove alone to work | 75.9%±10.7 pts |
| Public transportation | 0.0%±12.3 pts |
| Mean travel time to work | 50.2 min±21.2 |
| No health insurance coverage | 4.8%±3.3 pts |
Source: American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026); Census Bureau population estimates, Vintage 2025; 2020 Census; Building Permits Survey 2025 · Check it at data.census.gov