Lake St. Louis, Missouri Population 2026
Updated April 2026 · US Census ACS 2023 5-Year Estimates
The population of Lake St. Louis, Missouri is 17,538 as of the 2023 American Community Survey, making it the 48th-largest city in Missouri. The median household income is $123,427, the median home value is $375,300, and the median age is 43.2.
The population has grown 31.2% since 2010 (14,608 → 19,160).
17,538
Population
2052
People / sq mi
$123,427
Median Income
$375,300
Median Home Value
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Lake St. Louis covers 8.5 sq mi of land at 2052 people per square mile.
About Lake St. Louis, MO
What sets Lake St. Louis apart is money: median household income runs $123,427, above the US median of $78,538. Lake St. Louis is a city in Missouri with a population of 17,538. It ranks #48 among cities in Missouri by population.
Median household income is $123,427, above the US median of $78,538. Poverty is relatively low for US cities at 4.4%, below the national 12.4%. Homes carry a median value of $375,300, with typical rent around $1,608.
College attainment is above the local norm at 49.5%, above the national 35.0%. A solid 18.3% of workers are based at home, above the national 14.0%, and the average commute runs about 27 minutes each way.
Taken together, the income and housing figures place Lake St. Louis firmly in the higher-cost, higher-earning tier of US cities — a profile that tends to track dense job markets and competitive housing.
Lake St. Louis city Population History (2010-2024)
The city of Lake St. Louis city had a population of 14,608 in 2010 and 19,160 in 2024, a 31.2% growth over 14 years. The peak was 19,160 in 2024. Average annual growth rate: 1.97%.
19,160
Population (2024)
14,608
Population (2010)
19,160
Peak (2024)
1.97%
Avg Annual Growth
| Year | Population |
|---|---|
| 2010 | 14,608 |
| 2011 | 14,647 |
| 2012 | 14,748 |
| 2013 | 14,831 |
| 2014 | 15,008 |
| 2015 | 15,327 |
| 2016 | 15,716 |
| 2017 | 15,921 |
| 2018 | 16,215 |
| 2019 | 16,864 |
| 2020 | 16,789 |
| 2021 | 17,317 |
| 2022 | 18,335 |
| 2023 | 18,711 |
| 2024 | 19,160 |
Race & Ethnicity
| White | 87.6% |
| Black or African American | 4.2% |
| Asian | 0.0% |
| Hispanic or Latino (any race) | 1.1% |
| Two or More Races | 0.0% |
Economy & Income
$123,427
Median Household Income
$60,780
Per Capita Income
4.4%
Poverty Rate
3.0%
Unemployment Rate
Housing
$375,300
Median Home Value
$1,608
Median Rent
75.2%
Owner-Occupied
Education
97.2%
High School+
49.5%
Bachelor's+
Commute
0.0%
Drive Alone
75.3%
Public Transit
18.3%
Work From Home
26.8 min
Avg Commute
Community Profile
29.8%
Foreign Born
95.2%
Non-English at Home
9.1%
Veterans
11.6%
With Disability
96.9%
Health Insurance
98.3%
Internet Access
Employment by Industry
| Professional, Scientific & Management | 18.4% |
| Finance, Insurance & Real Estate | 16.0% |
| Information | 13.7% |
| Manufacturing | 8.7% |
| Education, Health Care & Social Services | 7.4% |
| Construction | 7.1% |
| Arts, Entertainment & Food Services | 4.7% |
| Retail Trade | 2.6% |
| Public Administration | 2.4% |
| Transportation & Warehousing | 1.5% |
| Agriculture & Mining | 0.9% |
Largest cities in Missouri
Largest counties in Missouri
Part of Missouri
Metro areas in Missouri
City rankings
Frequently Asked Questions
Lake St. Louis, Missouri has a population of 17,538 according to the US Census Bureau's 2023 American Community Survey 5-year estimates, making it the 48th-largest city in Missouri.
The median household income in Lake St. Louis, Missouri is $123,427, with 4.4% of residents living below the federal poverty level.
The median home value in Lake St. Louis, Missouri is $375,300, with median monthly rent at $1,608 and a homeownership rate of 75.2%.
The median age in Lake St. Louis, Missouri is 43.2 years. The population is 49.6% male and 50.4% female.
The population has grown 31.2% since 2010 (14,608 → 19,160).
Lake St. Louis city, MO Climate
Lake St. Louis city, MO has an average annual temperature of 12.5°C (55°F) and receives about 957 mm of precipitation per year. The warmest month is July and the coldest is January. Figures are 1970–2000 climate normals.
12.5°C
Avg Temp
957
Precip (mm/yr)
Jul
Hottest Month
Jan
Coldest Month
| Month | Avg (°C/°F) | Precip |
|---|---|---|
| January | -2° / 28° | 45 mm |
| February | 1° / 34° | 51 mm |
| March | 7° / 44° | 85 mm |
| April | 13° / 55° | 94 mm |
| May | 18° / 64° | 108 mm |
| June | 23° / 73° | 90 mm |
| July | 26° / 78° | 99 mm |
| August | 24° / 76° | 80 mm |
| September | 20° / 68° | 82 mm |
| October | 14° / 57° | 76 mm |
| November | 7° / 44° | 81 mm |
| December | 1° / 33° | 66 mm |
1970–2000 normals from WorldClim 2.1 (~9 km grid). Precipitation can be less precise near mountains or coastlines, where rainfall varies sharply over short distances.
Best time to visit Lake St. Louis city, MO
The most comfortable months to visit Lake St. Louis city, MO are typically September, June and August, when temperatures are mildest and rainfall is relatively low. The hottest month is July (around 32°C high). The coldest is January (near -7°C low). May is usually the wettest month.
Where to stay near Lake St. Louis
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Statewide data for Missouri
Population, race, income, age, and trends across Missouri
Data from the American Community Survey (ACS) 5-Year estimates.
Source: U.S. Census Bureau ACS, 2026.