Arnold Population 2026
Arnold has a population of 21,357, making it the #2224 biggest city in 🇺🇸 United States, located in Missouri. It is about 412× smaller than New York City, the country's biggest city.
Population (city proper)
21,357
Rank in United States
#2224
Coordinates
38.43°N, 90.38°W
~184 m elevation · America/Chicago
Distance to capital (Washington)
1,158 km
719 miles, straight line
Other big cities in Missouri
| City | Population | Rank in United States |
|---|---|---|
| Kansas City | 475,378 | #40 |
| St. Louis | 279,695 | #75 |
| Springfield | 170,188 | #157 |
| Columbia | 129,330 | #223 |
| Independence | 117,255 | #249 |
| Lee's Summit | 95,094 | #349 |
| O'Fallon | 85,040 | #420 |
| Saint Joseph | 76,780 | #481 |
Cities near Arnold
- Oakville36,143 people · ~8 km away
- University City35,058 people · ~26 km away
- St. Louis279,695 people · ~27 km away
- East Saint Louis27,006 people · ~29 km away
- Wildwood35,899 people · ~30 km away
- Chesterfield47,864 people · ~31 km away
FAQ
What is the population of Arnold?
Arnold has a population of 21,357 (city proper, latest official figure via GeoNames), making it the #2224 biggest city in United States.
What state is Arnold in?
Arnold is located in Missouri, United States.
Is Arnold the capital of United States?
No, the capital of United States is Washington D.C., about 1,158 km away.
Sources & notes
Population refers to the city proper (municipal boundaries), not the metropolitan area. Source: GeoNames (CC BY 4.0), retrieved 2026-07-07. Country data: UN World Population Prospects 2024.
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