55 ILCS 5/1-3005: County deemed organized.

The oath of office may be administered to the several county officers of such new county by any person authorized by law to administer oaths; and as soon as such county officers are duly qualified, the county shall be regarded as legally organized, and for judicial purposes shall be deemed and taken as belonging to the circuit in which such new county, or the greater part thereof, is embraced, and the circuit court shall be held at such place in the new county as the county board thereof shall designate, until the county seat thereof shall be permanently located.