St John city, MO Profile: Facts & Data


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St John city, Missouri - Basic Facts

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The City of Saint John had a population of 6,637 as of July 1, 2022. St John city 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 St John city is located at latitude 38.7148 and longitude -90.3463 in St. Louis County. The formal boundaries for the City of Saint John encompass a land area of 1.42 sq. miles and a water area of 0 sq. miles.

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

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  1. St John city 2022 Demographic Data
  2. Growth Rates for St John city (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

St John city, MO Data & Demographics (As of July 1, 2022)


Total Population 6,637 (100%)
Population in Households 6,572 (99.0%)
Population in Families 5,059 (76.2%)
Population in Group Quarters1 65 ( 1.0%)
Population Density 4,659
Diversity Index2 71


Median Household Income $58,699
Average Household Income $72,444
% of Income for Mortgage4 8%
Per Capita Income $28,870
Wealth Index5 50


Total HU (Housing Units) 2,944 (100%)
Owner Occupied HU 1,690 (57.4%)
Renter Occupied HU 944 (32.1%)
Vacant Housing Units 310 (10.5%)
Median Home Value $91,667
Average Home Value $142,785
Housing Affordability Index3 300


Total Households 2,634
Average Household Size 2.50
Family Households 1,626
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 -0.04% -0.21%
Households -0.20% -0.17%
Families   -0.22%
Median Household Income   4.18%
Per Capita Income   3.37%
Owner Occupied HU   0.04%

St John city, MO - Peer Comparisons by Rank and Percentile

The table below compares St John city 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 # 120 89th
Population Density # 28 98th
Median Household Income # 439 60th
Housing Affordability Index # 1034 96th
Per Capita Income # 561 48th
Diversity Index # 13 99th

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

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