Population 29,535 · Census ACS 2020–24
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Population and households in Lake St. Louis
Household size in Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 2.57 | 2.52 | 2.49 | 2.68 |
| 2010–14 | 2.72 | 2.53 | 2.52 | 2.73 |
| 2015–19 | 2.79 | 2.49 | 2.50 | 2.71 |
| 2020–24 | 2.75 | 2.46 | 2.49 | 2.65 |
| Change | +0.19 | −0.06 | −0.00 | −0.03 |
The typical household in Lake St. Louis holds 2.75 people, slightly more than the U.S. average of 2.65. Since 2006–10, household size has climbed from 2.57, even as the national average fell. Households are largest in the south and smallest in the northwest.
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 Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 37.6 | 38.5 | 38.4 | 37.7 |
| 2010–14 | 37.7 | 39.5 | 39.2 | 38.6 |
| 2015–19 | 40.9 | 40.7 | 40.0 | 39.6 |
| 2020–24 | 41.2 | 40.8 | 40.1 | 40.1 |
| Change | +3.6 | +2.3 | +1.7 | +2.3 |
At 41.2, the median age in Lake St. Louis is close to the national median of 40.1, so its age mix looks much like the country's. The median age has climbed from 37.6 in 2006–10, mirroring the country. Residents skew youngest in the south and oldest in the east.
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 Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 9.5% | 11.7% | 11.3% | 12.3% |
| 2010–14 | 10.6% | 11.5% | 11.4% | 12.3% |
| 2015–19 | 6.9% | 11.0% | 10.9% | 11.6% |
| 2020–24 | 7.1% | 11.1% | 11.0% | 11.6% |
| Change | −2.3 pts | −0.6 pts | −0.3 pts | −0.6 pts |
Single parents head only 7.1% of households in Lake St. Louis, well below the national share of 11.6%. Since 2006–10, the single-parent share has fallen 2.3 points, a much bigger shift than nationally. Lake St. Louis has a lower share of single-parent households than at least four in five Missouri 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 Lake St. Louis
Renters in Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 13.8% | 28.3% | 30.0% | 33.3% |
| 2010–14 | 17.0% | 30.1% | 32.1% | 35.6% |
| 2015–19 | 13.9% | 31.1% | 33.2% | 36.0% |
| 2020–24 | 16.8% | 29.6% | 31.9% | 34.8% |
| Change | +3.0 pts | +1.4 pts | +1.9 pts | +1.5 pts |
Only 16.8% of households in Lake St. Louis rent their homes, far below the national share of 34.8%, so most residents are owners who tend to stay put. More than one in five owners (22.0%) have paid off their mortgages, well below the national share of 39.8%. Rentals cluster in the north; owners are most common in the southwest. Since 2006–10, the renter share has risen 3.0 points, in line with the national trend.
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 Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.0% | 9.6% | 11.6% | 11.4% |
| 2010–14 | 4.6% | 10.1% | 12.0% | 11.4% |
| 2015–19 | 4.9% | 10.1% | 12.2% | 11.1% |
| 2020–24 | 4.4% | 8.8% | 10.5% | 9.6% |
| Change | −1.6 pts | −0.8 pts | −1.1 pts | −1.8 pts |
Only 4.4% of homes in Lake St. Louis are vacant, far below the national rate of 9.6%, which usually means strong demand for housing. Since 2006–10, vacancy has fallen 1.6 points, as it has nationally. Lake St. Louis has a lower vacancy rate than the great majority of Missouri cities.
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 Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 1996 | 1972 | 1974 | 1974 |
| 2010–14 | 1996 | 1972 | 1975 | 1975 |
| 2015–19 | 1998 | 1973 | 1976 | 1977 |
| 2020–24 | 2002 | 1975 | 1978 | 1980 |
| Change | +6 | +3 | +4 | +6 |
Lake St. Louis has newer housing than the country as a whole: the median home was built in 2002, versus 1980 nationally. The median year built has moved up from 1996 in 2006–10, a sign of steady new building. The newest homes are mostly in the southwest, the oldest in the north. Of the 191 Missouri cities with 5,000+ people, only four 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 Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | $1,131 | $825 | $740 | $965 |
| 2010–14 | $1,247 | $920 | $816 | $1,040 |
| 2015–19 | $1,117 | $1,010 | $899 | $1,213 |
| 2020–24 | $1,660 | $1,239 | $1,122 | $1,571 |
| Change | +$529 | +$414 | +$383 | +$606 |
A typical rental in Lake St. Louis costs $1,660 a month with utilities, above the national median of $1,571. Rents are up $529 a month from 2006–10, a 47% rise, a slower climb than the nation's. Rent takes 23.5% of the typical renter's income, comfortably under the 30% mark often used to define affordable rent. Only 13 of the 191 Missouri cities with 5,000+ people have higher rents.
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 Lake St. Louis
Bachelor's degrees in Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 39.0% | 30.3% | 26.0% | 28.4% |
| 2010–14 | 37.8% | 32.1% | 27.3% | 29.6% |
| 2015–19 | 44.9% | 34.9% | 29.6% | 32.1% |
| 2020–24 | 51.5% | 38.5% | 32.6% | 35.6% |
| Change | +12.4 pts | +8.3 pts | +6.6 pts | +7.2 pts |
College graduates are unusually common in Lake St. Louis: 51.5% of adults 25 and older have a bachelor's degree or higher, against 35.6% nationally. Education tends to track local incomes and the kinds of jobs nearby. Since 2006–10, the share with a degree has risen 12.4 points, as it has nationally.
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 Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 92.6% | 88.8% | 86.8% | 84.9% |
| 2010–14 | 95.1% | 90.5% | 88.3% | 86.1% |
| 2015–19 | 95.9% | 92.1% | 90.0% | 87.7% |
| 2020–24 | 97.3% | 93.6% | 91.8% | 89.3% |
| Change | +4.7 pts | +4.8 pts | +5.1 pts | +4.3 pts |
Finishing high school is nearly universal in Lake St. Louis: 97.3% 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 4.7 points since 2006–10, as it has nationally. Lake St. Louis has a higher share of high school graduates than the great majority of Missouri cities.
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 Lake St. Louis
| Period | Lake St. Louis | St. Louis area | Missouri | U.S. |
|---|---|---|---|---|
| 2006–10 | 6.8% | 7.7% | 7.4% | 8.1% |
| 2010–14 | 6.9% | 8.8% | 8.4% | 9.4% |
| 2015–19 | 2.8% | 4.9% | 4.6% | 5.6% |
| 2020–24 | 3.1% | 4.3% | 4.1% | 5.4% |
| Change | −3.7 pts | −3.4 pts | −3.3 pts | −2.7 pts |
The job market in Lake St. Louis has been strong: just 3.1% of the labor force was out of work and looking, well below the national rate of 5.4%. Unemployment is down 3.7 points from 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).
Lake St. Louis 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 |
|---|---|---|---|---|---|---|---|---|---|---|
| Lake St. Louis | 2.75 | 41.2 | 7.1% | 16.8% | 4.4% | 2002 | $1,660 | 51.5% | 97.3% | 3.1% |
| Dardenne Prairie | 2.79 | 41.1 | 8.1% | 17.6% | 3.8% | 2002 | $1,561 | 53.5% | 98.5% | 2.2% |
| O'fallon | 2.64 | 39.7 | 9.7% | 20.4% | 3.7% | 1996 | $1,403 | 39.3% | 94.7% | 3.5% |
| Josephville | 2.85 | 39.7 | 5.6% | 9.2% | 3.0% | 2006 | $1,053 | 39.3% | 95.9% | 2.7% |
| Wentzville | 2.85 | 37.6 | 9.8% | 16.7% | 2.9% | 2005 | $1,361 | 40.3% | 94.1% | 2.9% |
| Flint Hill | 2.81 | 35.7 | 14.9% | 31.6% | 2.7% | 2006 | $1,427 | 38.0% | 92.7% | 4.2% |
| St. Paul | 2.93 | 39.3 | 6.9% | 1.8% | 3.9% | 2010 | $1,391 | 44.7% | 97.8% | 0.6% |
| New Melle | 2.89 | 47.3 | 4.9% | 4.3% | 6.1% | 1995 | $1,460 | 49.5% | 96.8% | 2.2% |
| Defiance | 2.66 | 48.0 | 3.5% | 4.9% | 8.3% | 1997 | $1,339 | 55.0% | 96.5% | 2.0% |
| Cottleville | 2.77 | 43.1 | 6.5% | 11.4% | 5.1% | 1998 | $1,790 | 48.8% | 97.5% | 2.0% |
| Weldon Spring Heights | 2.62 | 49.7 | 3.6% | 20.2% | 10.4% | 2000 | $3,382 | 58.2% | 96.9% | 0.4% |
All figures 2020–24.
Cities with similar populations: Wallingford, CT · Brawley, CA · Yorkville, IL · Uniontown, PA · Yelm, WA · Vega Alta, PR · Wethersfield, CT · Westport, CT · West Springfield, VA · El Sobrante, CA
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 Lake St. Louis. 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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