Lake Saint Louis, MO Profile: Facts & Data


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Lake Saint Louis, Missouri - Basic Facts

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The City of Lake Saint Louis had a population of 18,005 as of July 1, 2022. Lake Saint Louis ranks in the upper quartile for Population Density and Diversity Index when compared to the other cities, towns and Census Designated Places (CDPs) in Missouri. See peer rankings below.

The primary coordinate point for Lake Saint Louis is located at latitude 38.7976 and longitude -90.7857 in St. Charles County. The formal boundaries for the City of Lake Saint Louis encompass a land area of 8.03 sq. miles and a water area of 0.81 sq. miles. St. Charles County is in the Central time zone (GMT -6). The elevation is 564 feet.

The City of Lake Saint Louis has a C1 Census Class Code which indicates an active incorporated place that does not serve as a county subdivision equivalent. It also has a Functional Status Code of "A" which identifies an active government providing primary general-purpose functions.

The City of Lake Saint Louis is located within Township of Lake Saint Louis, a minor civil division (MCD) of St. Charles County.

Jump to... (On This Page!)
  1. Lake Saint Louis 2022 Demographic Data
  2. Growth Rates for Lake Saint Louis (Historical & 5-Year Forecast)
  3. Peer Comparisons (Rank and Percentile)
  1. Neighborhoods Demographics (Home Values, Household Income, etc.)
  2. Missouri Research Tools (Easy Tools & Current Data)
  3. Missouri Data Comparison Tool - 2022 Demographics

Lake Saint Louis, MO Data & Demographics (As of July 1, 2022)


Total Population 18,005 (100%)
Population in Households 17,988 (99.9%)
Population in Families 15,228 (84.6%)
Population in Group Quarters1 17 ( 0.1%)
Population Density 2,108
Diversity Index2 30


Median Household Income $105,831
Average Household Income $142,072
% of Income for Mortgage4 18%
Per Capita Income $57,647
Wealth Index5 174


Total HU (Housing Units) 8,011 (100%)
Owner Occupied HU 5,979 (74.6%)
Renter Occupied HU 1,402 (17.5%)
Vacant Housing Units 631 ( 7.9%)
Median Home Value $354,460
Average Home Value $399,411
Housing Affordability Index3 145


Total Households 7,380
Average Household Size 2.44
Family Households 5,302
Average Family Size 3.00
  1. Group Quarters - a place where people live or stay in a group living arrangement. Includes college residents halls, nursing facilities, military barracks, and correctional facilities.
  2. The Diversity Index is a scale of 0 to 100 that represents the likelihood that two persons, chosen at random from the same area, belong to different races or ethnic groups. If an area's entire population belongs to one race AND one ethnic group, then the area has zero diversity. An area's diversity index increases to 100 when the population is evenly divided into two or more race/ethnic groups.
  3. The Housing Affordability Index base is 100 and represents a balance point where a resident with a median household income can normally qualify to purchase a median price home. Values above 100 indicate increased affordability, while values below 100 indicate decreased affordability.
  4. The % of Income for Mortgage quantifies the percentage of median household income dedicated to mortgage payments on a home priced at the median value (assuming a 30-year mortgage and a 20% down payment).
  5. The Wealth Index is based on a number of indicators of affluence including average household income and average net worth, but it also includes the value of material possessions and resources. It represents the wealth of the area relative to the national level. Values above or below 100 represent above-average wealth or below-average wealth compared to the national level.


2020-2022 2022-2027
Population 3.38% 0.80%
Households 3.34% 0.93%
Families   0.87%
Median Household Income   1.87%
Per Capita Income   2.02%
Owner Occupied HU   1.28%

Lake Saint Louis, MO - Peer Comparisons by Rank and Percentile

The table below compares Lake Saint Louis to the other 1,082 incorporated cities, towns and CDPs in Missouri by rank and percentile using July 1, 2022 data. The location Ranked # 1 has the highest value. A location that ranks higher than 75% of its peers would be in the 75th percentile of the peer group.

Variable Description Rank Percentile
Total Population # 47 96th
Population Density # 98 91st
Median Household Income # 34 97th
Housing Affordability Index # 413 38th
Per Capita Income # 32 97th
Diversity Index # 234 79th

Additional comparisons and rankings can be made with a VERY EASY TO USE Missouri Census Data Comparison Tool.

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