Dahlgren is a village located in Hamilton County, in the state of Illinois (IL), United States. Nestled in the East North Central division of the Midwest region, it covers an area of 1.0 square miles (3.0 km²) and sits at an elevation of 510 ft. With a population of approximately 514 residents, Dahlgren offers a peaceful, rural atmosphere.
The town's population is composed of about 47.67% males and 52.33% females, and it has a population density of 514.00 people per square mile (198.46/km²). Dahlgren lies at a latitude of 38.2 and a longitude of -88.69, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (18.5%), followed by English (17.1%), German (23.3%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 62828.