Henry is a city located in Marshall 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 1.4 square miles (4.0 km²) and sits at an elevation of 495 ft. With a population of approximately 2,540 residents, Henry offers a peaceful, rural atmosphere.
The town's population is composed of about 46.85% males and 53.15% females, and it has a population density of 827.34 people per square mile (705.54/km²). Henry lies at a latitude of 41.11 and a longitude of -89.36, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (0%), followed by English (13.3%), German (34.6%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 61537.