Population 31,073 · Census ACS 2020–24
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Population and households in O'Fallon
Household size in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.78 | 2.52 | 2.69 | 2.68 |
| 2010–14 | 2.81 | 2.53 | 2.71 | 2.73 |
| 2015–19 | 2.70 | 2.49 | 2.66 | 2.71 |
| 2020–24 | 2.63 | 2.46 | 2.58 | 2.65 |
| Change | −0.15 | −0.06 | −0.11 | −0.03 |
At 2.63 people per household, O'Fallon sits close to the national average of 2.65. The typical household here is bigger than in the St. Louis area as a whole, where it has 2.46 people. Household size has dropped from 2.78 in 2006–10, a much bigger shift than nationally.
Household size: the average number of people living in each occupied home. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25010).
Median age in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 35.5 | 38.5 | 37.6 | 37.7 |
| 2010–14 | 36.6 | 39.5 | 38.5 | 38.6 |
| 2015–19 | 37.9 | 40.7 | 39.6 | 39.6 |
| 2020–24 | 39.9 | 40.8 | 40.2 | 40.1 |
| Change | +4.5 | +2.3 | +2.6 | +2.3 |
Half of the people in O'Fallon are younger than 39.9 and half are older, close to the national median of 40.1. Since 2006–10, the median age has climbed from 35.5, mirroring the country. Residents skew youngest in the west and oldest in the southeast.
Median age: the age that splits residents into two equal halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B01002).
Single-parent households in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 12.2% | 11.7% | 11.7% | 12.3% |
| 2010–14 | 11.2% | 11.5% | 11.7% | 12.3% |
| 2015–19 | 9.9% | 11.0% | 11.1% | 11.6% |
| 2020–24 | 11.7% | 11.1% | 11.3% | 11.6% |
| Change | −0.5 pts | −0.6 pts | −0.4 pts | −0.6 pts |
Single parents head nearly one in eight households in O'Fallon (11.7%), close to the national share of 11.6%. O'Fallon has a higher share of single-parent households than most Illinois cities.
Single-parent households: households where one adult with no spouse present lives with children under 18. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B11003).
Housing in O'Fallon
Renters in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 31.6% | 28.3% | 30.8% | 33.3% |
| 2010–14 | 29.3% | 30.1% | 33.1% | 35.6% |
| 2015–19 | 31.2% | 31.1% | 33.9% | 36.0% |
| 2020–24 | 30.6% | 29.6% | 32.9% | 34.8% |
| Change | −1.0 pts | +1.4 pts | +2.1 pts | +1.5 pts |
Most households in O'Fallon own their homes; 30.6% rent, a little below the national share of 34.8%. Among owners, 28.7% have paid off their mortgages, well below the national share of 39.8%. Rentals cluster in the southwest; owners are most common in the northeast. The renter share has edged down 1.0 points since 2006–10, even as the national share rose.
Renters: occupied homes that are rented rather than owned. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25003).
Vacant homes in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.8% | 9.6% | 10.0% | 11.4% |
| 2010–14 | 6.0% | 10.1% | 10.1% | 11.4% |
| 2015–19 | 6.8% | 10.1% | 9.8% | 11.1% |
| 2020–24 | 6.6% | 8.8% | 8.1% | 9.6% |
| Change | −0.3 pts | −0.8 pts | −1.9 pts | −1.8 pts |
Fewer homes sit empty in O'Fallon than nationally: 6.6%, against 9.6% for the U.S. Vacancy is little changed from 2006–10, while the national rate fell.
Vacant homes: homes with no one living in them, including vacation homes and homes for sale or rent. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25002).
Age of homes in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 1989 | 1972 | 1966 | 1974 |
| 2010–14 | 1991 | 1972 | 1967 | 1975 |
| 2015–19 | 1991 | 1973 | 1968 | 1977 |
| 2020–24 | 1994 | 1975 | 1970 | 1980 |
| Change | +4 | +3 | +4 | +6 |
O'Fallon has newer housing than the country as a whole: the median home was built in 1994, versus 1980 nationally. The median year built has moved up from 1989 in 2006–10, a sign of steady new building. The newest homes are mostly in the northwest, the oldest in the center. Only 25 of the 388 Illinois cities with 5,000+ people have newer homes.
Age of homes: the year that splits the housing stock into older and newer halves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25035).
Rent in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,080 | $825 | $953 | $965 |
| 2010–14 | $1,209 | $920 | $1,028 | $1,040 |
| 2015–19 | $1,299 | $1,010 | $1,165 | $1,213 |
| 2020–24 | $1,554 | $1,239 | $1,428 | $1,571 |
| Change | +$474 | +$414 | +$475 | +$606 |
The median renter in O'Fallon pays $1,554 a month for rent and utilities, close to the national median of $1,571. Rents here are higher than in the wider St. Louis area ($1,239). Rents are up $474 a month from 2006–10, a 44% rise, a slower climb than the nation's. Rent takes 29.8% of the typical renter's income, just under the 30% mark often used to define affordable rent.
Rent: monthly rent plus the utilities renters pay themselves. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B25064).
Education in O'Fallon
Bachelor's degrees in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 45.2% | 30.3% | 31.2% | 28.4% |
| 2010–14 | 47.5% | 32.1% | 32.4% | 29.6% |
| 2015–19 | 49.5% | 34.9% | 34.7% | 32.1% |
| 2020–24 | 50.8% | 38.5% | 37.7% | 35.6% |
| Change | +5.6 pts | +8.3 pts | +6.5 pts | +7.2 pts |
O'Fallon is highly educated: about half of adults 25 and older (50.8%) hold at least a bachelor's degree, far above the national share of 35.6%. The share with a degree has risen 5.6 points since 2006–10, in line with the national trend. O'Fallon has a higher share of college graduates than at least four in five Illinois cities.
Bachelor's degrees: adults 25 and older with a bachelor's degree or higher. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
High school graduates in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 94.9% | 88.8% | 86.3% | 84.9% |
| 2010–14 | 96.1% | 90.5% | 87.5% | 86.1% |
| 2015–19 | 96.5% | 92.1% | 89.1% | 87.7% |
| 2020–24 | 97.4% | 93.6% | 90.3% | 89.3% |
| Change | +2.4 pts | +4.8 pts | +4.0 pts | +4.3 pts |
Finishing high school is nearly universal in O'Fallon: 97.4% of adults 25 and older have a diploma or equivalent, well above the national rate of 89.3%. The share with a diploma has risen 2.4 points since 2006–10, in line with the national trend. Only 37 of the 388 Illinois cities with 5,000+ people have a higher share of high school graduates.
High school graduates: adults 25 and older with a high school diploma, GED or more. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B15003).
Jobs in O'Fallon
| Period | O'Fallon | St. Louis area | Illinois | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.8% | 7.7% | 8.7% | 8.1% |
| 2010–14 | 8.7% | 8.8% | 10.2% | 9.4% |
| 2015–19 | 4.3% | 4.9% | 6.1% | 5.6% |
| 2020–24 | 3.4% | 4.3% | 6.0% | 5.4% |
| Change | −3.5 pts | −3.4 pts | −2.7 pts | −2.7 pts |
Unemployment in O'Fallon runs below the national rate: 3.4% of the labor force was out of work and looking, against 5.4% nationally. Unemployment has fallen 3.5 points since 2006–10, in line with the national trend. Because the Census pools five years of responses (2020–24), these rates smooth over short swings and lag the current job market.
Unemployment: people looking for work as a share of everyone working or looking. Source: BestNeighborhood calculations from U.S. Census Bureau ACS 5-year block-group estimates (table B23025).
O'Fallon compared with nearby cities
| City | Household size | Median age | Single parents | Renters | Vacant homes | Median year built | Median rent | Bachelor's degree | High school diploma | Unemployment |
|---|---|---|---|---|---|---|---|---|---|---|
| O'Fallon | 2.63 | 39.9 | 11.7% | 30.6% | 6.6% | 1994 | $1,554 | 50.8% | 97.4% | 3.4% |
| Shiloh | 2.46 | 42.2 | 10.3% | 37.4% | 5.5% | 1997 | $1,367 | 41.9% | 97.2% | 2.4% |
| Fairview Heights | 2.40 | 39.7 | 13.4% | 32.2% | 12.2% | 1975 | $1,224 | 34.5% | 92.7% | 5.8% |
| Lebanon | 2.55 | 38.9 | 7.2% | 23.1% | 9.4% | 1990 | $1,317 | 43.5% | 96.5% | 3.0% |
| Swansea | 2.47 | 40.9 | 9.0% | 26.7% | 7.9% | 1988 | $1,241 | 40.3% | 96.6% | 6.3% |
| Scott AFB | 3.01 | 29.7 | 12.2% | 96.1% | 4.1% | 1987 | $1,650 | 36.7% | 99.0% | 3.7% |
| Caseyville | 2.85 | 44.0 | 6.6% | 19.9% | 10.7% | 1981 | $1,409 | 33.0% | 91.6% | 5.5% |
| Lumaghi Heights | 2.71 | 49.1 | 5.3% | 5.1% | 5.3% | 1993 | $1,319 | 47.8% | 96.0% | 1.5% |
| Scott Air Force Base | 3.98 | 22.5 | 10.8% | 81.1% | 2.2% | 2006 | $1,764 | 67.2% | 99.2% | 0.6% |
| Belleville | 2.36 | 40.8 | 14.5% | 33.8% | 10.8% | 1967 | $1,105 | 29.9% | 94.3% | 5.0% |
| Collinsville | 2.31 | 39.3 | 12.7% | 31.1% | 8.0% | 1970 | $1,044 | 30.6% | 92.9% | 4.1% |
All figures 2020–24.
Cities with similar populations: Fountain, CO · Dawsonville, GA · Denison, TX · Dinuba, CA · Drexel Hill, PA · East Palo Alto, CA · Elgin, SC · Elkhorn, NE · Elmira, NY · Endicott, NY
About these numbers
Every figure on this page is a BestNeighborhood calculation from the Census Bureau's American Community Survey (ACS), built up from the Census block groups that make up O'Fallon. Each ACS 5-year release pools five years of responses; this page shows the last 15 releases, 2006–10 through 2020–24. Neighboring releases share four of their five years, so they move gradually and small changes between them are within the survey's margin of error; in small places the lines can jump from one release to the next for the same reason. The maps show the same measures for each neighborhood, ranked against the whole country.
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