List of commandants of the Illinois Country

The Illinois Country was governed by military commandants for its entire period under French and British rule, and during its time as a county of Virginia.

The commandant of the fort was the top French official in the region and was responsible to the Governor General of New France.

The new seat of government was Fort de Chartres, located in what is now southeastern Illinois among the growing French settlements of Cahokia, Kaskaskia and Prairie du Rocher.

After the Seven Years' War ended in 1763, the Treaty of Paris awarded Great Britain the east bank of the Mississippi, from below Baton Rouge northwards.

Due to the outbreak of Pontiac's War, British forces were unable to take control of the Illinois forts until 1765.