St. Augustine, Illinois Demographics & Population 2026
During the 2020–2024 ACS period, St. Augustine, Illinois had a total population of 92, the 1343rd largest village in Illinois. The poverty rate is 23.9%.
Data vintage: U.S. Census Bureau ACS 2020–2024 5-Year Estimates · refreshed July 2026 · Methodology & source notes
Key Takeaways
- Only 4.8% of adults have a bachelor's degree, well below the national average of 35.7%.
St. Augustine Quick Facts
How St. Augustine 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 | 123 | 92 | -25.2% |
| Median home value | $52,700 | $49,000 | -7.0% |
How St. Augustine 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
A less diverse community where one racial or ethnic group represents a large majority.
State average: 61 | National average: 61
Education
Educational Attainment (Adults 25+)
St. Augustine Rankings in Illinois
Explore Illinois Rankings
Other Cities in Knox County
| City | Population | Median Income | Poverty | Home Value |
|---|---|---|---|---|
| Galesburg | 29,481 | $48,297 | 19.1% | $96,400 |
| Abingdon | 3,443 | $61,653 | 9.2% | $99,600 |
| Knoxville | 3,211 | $82,863 | 7.2% | $145,300 |
| Oak Run | 800 | $100,417 | 3.3% | $298,300 |
| Oneida | 719 | $66,791 | 3.6% | $114,100 |
| East Galesburg | 713 | $79,333 | 17.5% | $123,700 |
| Wataga | 710 | $62,917 | 9.3% | $97,600 |
| Williamsfield | 531 | $82,417 | 4.0% | $109,800 |
| Yates City | 500 | $63,750 | 6.3% | $97,100 |
| Altona | 498 | $69,375 | 7.6% | $102,000 |
Cities Similar to St. Augustine
These cities in the same state have comparable population and economic profiles.
| City | Population | Median Income | Home Value | Bachelor's+ | Poverty |
|---|---|---|---|---|---|
| Gulfport | 92 | $60,000 | N/A | 12.0% | 42.4% |
| Lake City | 92 | N/A | N/A | 10.9% | 0.0% |
| Ophiem | 92 | $42,969 | $96,800 | 22.6% | 68.5% |
| Wilmington | 92 | $74,167 | $34,500 | 7.1% | 31.5% |
| New Salem | 93 | $46,875 | $84,000 | 23.8% | 24.7% |
A note before these figures: with a population of 92, St. Augustine'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. Augustine is a small community located in Illinois, within Knox County. The total population is 92. It ranks as the 1343rd most populous out of 1,445 Census-designated places in Illinois.
Age Demographics
The median age in St. Augustine is 60.3 years. This is 55% higher than the state median of 39.0 years. Only 5.4% of residents are under 18, indicating fewer families with children.
Economy, Income & Housing
The poverty rate stands at 23.9%. This is 102% 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 3.7%. This is 37% lower than the state rate of 5.8%. The median home value is $49,000. Housing costs are 81% lower than the state median of $263,300. 87.3% of occupied housing units are owner-occupied. This homeownership rate is 30% higher than the state average of 67.1%.
Race & Ethnicity
St. Augustine has a predominantly White (non-Hispanic) population, comprising 98.9% of all residents. Hispanic or Latino residents account for 1.1%. The White (non-Hispanic) population is significantly higher than the state average (98.9% vs 58.1%). The Hispanic or Latino population (1.1%) is well below the state average of 18.8%.
Education
4.8% of residents aged 25 and older hold a bachelor's degree or higher. This is among the lowest rates in the state, which may correlate with employment and income patterns. This is 87% 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 95.2%.
Data Sources & Methodology
All demographic data for St. Augustine, 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. Augustine, Illinois?
St. Augustine, Illinois has a population of 92 according to the most recent U.S. Census ACS 5-Year Estimates.
What is the median household income in St. Augustine, IL?
The Census Bureau does not publish a reliable median household income estimate for St. Augustine — the community is too small for the ACS sample. The national median is $80,734.
What is the poverty rate in St. Augustine, IL?
The poverty rate in St. Augustine is 23.9%. This means approximately 22 residents live below the federal poverty line.
What is the racial makeup of St. Augustine, Illinois?
St. Augustine's population is 98.9% White, 0.0% Black, 1.1% Hispanic/Latino, and 0.0% Asian.
What is the median home value in St. Augustine, IL?
The median home value in St. Augustine is $49,000.
How educated is St. Augustine, Illinois?
4.8% of adults (25+) in St. Augustine hold a bachelor's degree or higher, and 1.2% hold a graduate or professional degree.