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Hello and welcome to the Genealogy Trails website for St. Charles County, Missouri.

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County History

St. Charles County is located in the state of Missouri just northwest of St Louis. It’s county seat is St Charles. The county has a total area of 592; miles. 560 miles is land and 32 miles is water.
By 1760, French traders, trappers and missionaries had penetrated the Mississippi River Valley and established settlements as far south as the Missouri River in St. Charles County. Louis Blanchette, a French Canadian fur trader, established an active riverfront trading post on the Missouri River and named the area "Les Petites Cotes" or Little Hills. Except for a brief period when the area was deeded to Spain, the territory remained under French control until acquired by the United States as part of the Louisiana Purchase.
Sioux, Osage, and other indian tribes were already here before the Europeans explored this area. These native Americans were drawn to the beautiful spring in Weldon Spring where an unlimited supply of pure, sparkling water flowed out of the rocky hillside.
In 1804, after the Louisiana Purchase, the name was changed from San Carlos to St. Charles.
The county was organized on October 1, 1812
After construction of Interstate 70 in the mid-1950’s population growth in St. Charles County accelerated due to convenient access to St. Louis.

Organized in 1812 Incorporated in 1830

Named for the Spanish district once located here, San Carlos, from Saint Charles Borromeo.

County Seat is the city of St. Charles.

Located just N.W. of St Louis,
St. Charles has a total area of 592 miles.
560 miles is land
32 miles is water




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St. Charles City Hall
200 N. 2nd Street
St. Charles, MO 63306
(636) 949-3200
Monday-Friday 8 AM to 5 PM

County Administration Building
201 N. 2nd Street
St. Charles, MO 63306
(636) 949-7505

Circuit Court Clerk
800 N 2nd
St. Charles, MO 63306

Missouri Department of Health
Box 570
Jefferson City, MO 65102

St. Charles Missouri Department of Health
1650 Boones Lick Road
St. Charles, MO 63301
Toll Free (800)822-4012 ext. 7400

Lewis & Clark Center
701 Riverside Drive
St. Charles, MO 63301

Historical Society of Missouri
1020 Lowry Street
Columbia, MO 65201

St. Charles County Historical Society
101 S. Main Street
St Charles, MO 63306
Hours: M W F  10-3

St. Charles County Genealogical Society
PO Box 715
St. Charles, MO 63302

Historic Daniel Boone Home & Boonesfield Village
1868 Highway F
Defiance, MO 63341

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