St Clair County Genealogical Society – Our many indexes and finding aids will help you discove, Births, marriages, deaths, burials, baptisms and other church records which name parents are free to genealogy and history researchers of St. Clair countians from the 1790s into the 21st century, residents of Belleville, East St. Louis, Freeburg, Mascoutah, Marissa, New Athens, O'Fallon, Smithton, and all lands in between.