Chapin is a village located in Morgan 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 628 ft. With a population of approximately 592 residents, Chapin offers a peaceful, rural atmosphere.
The town's population is composed of about 51.86% males and 48.14% females, and it has a population density of 604.08 people per square mile (233.24/km²). Chapin lies at a latitude of 39.77 and a longitude of -90.4, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (8.4%), followed by English (10.8%), German (27.4%), and Scotch-Irish (1.9%) heritage. The town is identified by the ZIP code 62628.