Dahlgren
- County:
- Hamilton County
- County Seat:
- No
- Area (mi²):
- 1.017
- State:
- Illinois
Dahlgren is a village located in Hamilton County, Illinois. Dahlgren has a 2026 population of 493. Dahlgren is currently declining at a rate of -0.8% annually and its population has decreased by -1.99% since the most recent census, which recorded a population of 503 in 2020.
The median household income in Dahlgren is $44,861 with a poverty rate of 22.02%. The median age in Dahlgren is 25.1 years: 25.2 years for males, and 24.9 years for females. For every 100 females there are 89.5 males.