Wheaton is a suburban city in Milton and Winfield Townships and is the county seat of DuPage County, Illinois. It is located approximately 25 miles (40 km) west of Chicago. As of the 2010 census, the city had a total population of 52,894, which was estimated to have decreased to 52,745 by July 2019, making it the 27th most populous municipality in Illinois.
The city dates its founding to the period between 1831 and 1837, following the Indian Removal Act, when Erastus Gary laid claim to 790 acres (320 ha) of land near present-day Warrenville. The Wheaton brothers arrived from Connecticut, and in 1837, Warren L. Wheaton laid claim to 640 acres (260 ha) of land in the center of town. Jesse Wheaton later made claim to 300 acres (120 ha) of land just west of Warren's. It was not long before other settlers from New England joined them in the community. In 1848, they gave the Galena and Chicago Union Railroad three miles (5 km) of right-of-way, upon which railroad officials named the depot Wheaton. In 1850, ten blocks of land were platted and anyone who was willing to build immediately was granted free land. In 1853, the lots were surveyed and a formal plat for the community was filed with the county.