Missouri County

St. Francois County, Missouri

The Old Lead Belt and Missouri's mining heritage - from Bonne Terre Mine's underground lake (the world's largest known underwater cave system open to scuba divers - 24 miles of flooded mine shafts from the St. Joseph Lead Company's operations that ended in 1962, now attracting thousands of divers annually to explore the preserved Victorian-era mining infrastructure beneath a Missouri town) to Farmington's role as the commercial hub of the Old Lead Belt - the mining district that made Missouri the world's leading lead producer for decades - and a southeastern Missouri county whose mineral wealth shaped American industrial history.

County Seat Farmington
Population 67,000
Founded 1821
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