Decatur Population 2026
Decatur has a population of 73,254, making it the #519 biggest city in 🇺🇸 United States, located in Illinois. It is about 120× smaller than New York City, the country's biggest city.
Population (city proper)
73,254
Rank in United States
#519
Coordinates
39.84°N, 88.95°W
~205 m elevation · America/Chicago
Distance to capital (Washington)
1,029 km
639 miles, straight line
Other big cities in Illinois
| City | Population | Rank in United States |
|---|---|---|
| Chicago | 2,664,452 | #3 |
| Aurora | 200,661 | #125 |
| Rockford | 148,278 | #184 |
| Joliet | 147,861 | #186 |
| Naperville | 147,100 | #190 |
| Peoria | 115,070 | #259 |
| Springfield | 114,394 | #262 |
| North Peoria | 113,004 | #266 |
Cities near Decatur
- Springfield114,394 people · ~59 km away
- Mattoon18,113 people · ~64 km away
- Champaign86,096 people · ~68 km away
- Urbana42,311 people · ~70 km away
- Bloomington78,292 people · ~72 km away
- Normal54,373 people · ~75 km away
FAQ
What is the population of Decatur?
Decatur has a population of 73,254 (city proper, latest official figure via GeoNames), making it the #519 biggest city in United States.
What state is Decatur in?
Decatur is located in Illinois, United States.
Is Decatur the capital of United States?
No, the capital of United States is Washington D.C., about 1,029 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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