Lyndon is a village located in Whiteside 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 0.8 square miles (2.0 km²) and sits at an elevation of 615 ft. With a population of approximately 566 residents, Lyndon offers a peaceful, rural atmosphere.
The town's population is composed of about 50.53% males and 49.47% females, and it has a population density of 690.24 people per square mile (266.50/km²). Lyndon lies at a latitude of 41.72 and a longitude of -89.92, operating in the UTC-6.
Locals reflect a blend of American ancestry, with roots primarily in United States (10.1%), followed by English (9.5%), German (26.1%), and Scotch-Irish (0%) heritage. The town is identified by the ZIP code 61261.