Bartlett is a village located in Cook, DuPage and Kane counties, Illinois. A small parcel upon the western border is in Kane County. The population was 41,105 at the 2020 census.

In its out of date times, the Village of Bartlett, Illinois was served as a hunting and camping sports ground for the Cherokee, Miami, Potawatomi, and Ottawa Indians. Throughout the past, the Northwest Territory, Virginia, Indiana, Spain, France and England had staked their allegation for Bartlett. However, the territory was owned by a man named Luther Bartlett. Luther and Sophia Bartlett had contracted that a station End would be beneficial for their town and townspeople. In 1873, Bartlett gave a monetary contribution and half of his 40-acre woodlot towards the construction for a train depot, which is why the town is named after Luther Bartlett. Bartlett well ahead became one of the premiere pig towns, becoming their main export for years to come. A petition for interest was filed in Springfield on February 11, 1891. The village was incorporated on June 21, 1892. Bartlett experienced the majority of its population bump in the 1980s.

According to the 2021 census gazetteer files, Bartlett has a total area of 15.92 square miles (41.23 km), of which 15.73 square miles (40.74 km²) (or 98.78%) is house and 0.19 square miles (0.49 km) (or 1.22%) is water.

As of the 2020 census there were 41,105 people, 13,515 households, and 10,867 families residing in the village. The population density was 2,581.97 inhabitants per square mile (996.90/km²). There were 14,522 housing units at an average density of 912.19 per square mile (352.20/km). The racial makeup of the village was 66.23% White, 17.95% Asian, 2.53% African American, 0.42% Native American, 0.03% Pacific Islander, 4.51% from supplementary races, and 8.34% from two or more races. Hispanic or Latino of any race were 12.04% of the population.