St. Johns, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, St. Johns, Illinois had a total population of 184, the 1223rd largest village in Illinois, with a median household income of $62,500, which is 25% lower than the state average. The poverty rate is 14.4%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Housing is very affordable with a home-value-to-income ratio of just 1.3x.
St. Johns Quick Facts
How St. Johns Changed
Change from the 2019–2023 ACS period to 2020–2024. These are rolling five-year estimates, not year-over-year measurements.
| Metric | 2019–2023 | 2020–2024 | Change |
|---|---|---|---|
| Population | 134 | 184 | +37.3% |
| Median household income | $39,286 | $62,500 | +59.1% |
| Median home value | $80,000 | $80,000 | +0.0% |
How St. Johns Compares
Median Household Income
Median Home Value
Economy & Housing
Household Income Distribution
Detailed income brackets
Employment
Housing Overview
People & Demographics
Age Distribution
Race & Ethnicity
Diversity Index
Moderate diversity with one or two groups making up the majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
St. Johns Rankings in Illinois
Explore Illinois Rankings
Other Cities in Perry County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Du Quoin | 5,726 | $54,409 | 29.6% | $83,100 |
| Pinckneyville | 5,018 | $69,583 | 9.1% | $133,500 |
| Tamaroa | 597 | $48,646 | 7.3% | $80,200 |
| Willisville | 467 | $55,417 | 12.0% | $57,300 |
| Cutler | 302 | $65,500 | 25.8% | $61,000 |
Cities Similar to St. Johns
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Serena | 182 | N/A | N/A | 14.5% | 23.1% |
| Oakford | 191 | $65,000 | $100,600 | 8.5% | 7.4% |
| Glasgow | 179 | $57,083 | $61,000 | 4.6% | 2.2% |
| Rutland | 195 | $60,625 | $76,400 | 5.0% | 9.7% |
| LaPlace | 170 | N/A | $86,800 | 13.6% | 35.3% |
A note before these figures: with a population of 184, St. Johns'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
St. Johns is a small community located in Illinois, within Perry County. The total population is 184. It ranks as the 1223rd most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in St. Johns is 46.4 years. This is 19% higher than the state median of 39.0 years.
Economy, Income & Housing
The median household income in St. Johns is $62,500. This is 25% lower than the state median of $83,390. It is also 23% lower than the national median of $80,734. The poverty rate stands at 14.4%. This is 22% higher than the state poverty rate of 11.8%. The unemployment rate is 4.3%. This is 27% lower than the state rate of 5.8%. The median home value is $80,000. Housing costs are 70% lower than the state median of $263,300. With a home-value-to-income ratio of just 1.3x, St. Johns is one of the most affordable housing markets in the area. 58.7% of occupied housing units are owner-occupied. This homeownership rate is 13% lower than the state average of 67.1%.
Race & Ethnicity
The largest racial or ethnic group in St. Johns is White (non-Hispanic), making up 76.1% of the population. Asian residents account for 9.2%. The Hispanic or Latino population (3.8%) is well below the state average of 18.8%. The Asian population is significantly higher than the state average (9.2% vs 5.9%).
Education
18.9% of residents aged 25 and older hold a bachelor's degree or higher. This is 50% 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 93.7%.
Data Sources & Methodology
All demographic data for St. Johns, 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.
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Frequently Asked Questions
What is the population of St. Johns, Illinois?
St. Johns, Illinois has a population of 184 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in St. Johns, IL?
The median household income in St. Johns is $62,500, which is 23% lower than the national median of $80,734.
What is the poverty rate in St. Johns, IL?
The poverty rate in St. Johns is 14.4%. This means approximately 26 residents live below the federal poverty line.
What is the racial makeup of St. Johns, Illinois?
St. Johns's population is 76.1% White, 0.0% Black, 3.8% Hispanic/Latino, and 9.2% Asian.
What is the median home value in St. Johns, IL?
The median home value in St. Johns is $80,000. The home-value-to-income ratio is 1.3x.
How educated is St. Johns, Illinois?
18.9% of adults (25+) in St. Johns hold a bachelor's degree or higher, and 12.6% hold a graduate or professional degree.