Arnold Flag

Arnold

County Seat:
No
Area (mi²):
11.528
State:
Missouri

Arnold is a city located in Jefferson County, Missouri. Arnold has a 2026 population of 21,036. Arnold is currently declining at a rate of -0.31% annually but its population has increased by 0.61% since the most recent census, which recorded a population of 20,908 in 2020.

21K
Total Population
1,825
Density (mi²)
-66 -0.31%
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)