Welcome to St. Clair County, located in Southwestern Illinois across the Mississippi River from St. Louis. Established in 1790, it is Illinois’ oldest county.

• The COLLECTIONS menu displays the databases by topic, read about our newest Member Benefits, birth certificate indexes 1910–1919  Please consider joining SCCGS to support its endeavors, or Donate.
• Cemeteries and churches records are our specialty, many available for purchase in our Store (upper right corner). Read more about them.
• The Quarterly surname indexes are now combined with an article index.   Discover pertinent articles for those with your ancestor’s name or business. Over a quarter million St. Clair ancestors are indexed. 

We gratefully acknowledge the efforts of SCCGS volunteers who preserve and publish extensive information about our ancestors’ sojourn here. Meet us at free lectures and events.

SEARCH across the entire site for your ancestors, whether rooted in the county’s early 18th century French settlements; Americans who migrated from the east coast and southern States, German, Irish and English immigrants who arrived 1830-1860s, or eastern European settlers who found new homes here at the dawn of the 20th century.