St. John Flag

St. John

County Seat:
No
Area (mi²):
1.424
State:
Missouri

St. John is a city located in St. Louis County, Missouri. St. John has a 2026 population of 6,472. St. John is currently declining at a rate of -0.11% annually and its population has decreased by -2.35% since the most recent census, which recorded a population of 6,628 in 2020.

6.5K
Total Population
4,545
Density (mi²)
-7 -0.11%
Growth

Nearby Cities

Sources

  1. US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
  2. US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
  3. American Community Survey (2009 - 2013)
  4. Census QuickFacts
  5. Historical Populations of States and Counties (1790 - 1990)