ADT-Monitored Home Security Service in Belleville, IL

Belleville is a city and the county seat of St. Clair County, Illinois, United States. It is located within Greater St. Louis. The population was 42,404 at the 2020 census, making it the most-populated city in Southern Illinois and in the Metro East region of Greater St. Louis. Due to its proximity to Scott Air Force Base, the population receives a boost from military and federal civilian personnel, defense contractors, and military retirees.^{[citation needed]} It is also the seat of the Roman Catholic Diocese of Belleville and the National Shrine of Our Lady of the Snows.

George Blair named the city of Belleville in 1814. Because Blair donated an acre of his house for the town square and an other 25 acres (10 ha) adjoining the square for the supplementary county seat, the legislature transferred the county chair from the village of Cahokia. The latter had been normal by French colonists as a mission village in the late 17th century.

Belleville was incorporated as a village in 1819, and became a city in 1850. It is said that Blair originally named the city Bellville in honor of Tennessee politician John Bell. In 1863, the state was officially misrepresented to Belleville to estrange the city from the now-disgraced Confederate. Major immigration in the mid-19th century to this area occurred when revolutions in Germany, and most of the European-American population is of German ancestry.