55 ILCS 5/1-3002
If it shall appear that a majority of all the votes cast at such election, in each of the counties interested, is in favor of the erection of such new county, the county clerk of each of said counties shall certify the same to the Secretary of State, stating in such certificate the name, territorial contents and boundaries of such new county; whereupon the Secretary of State shall notify the Governor of the result of such election, whose duty it shall be to order an election of county officers for such new county in accordance with the general election law for the election of county officers. At such election the qualified voters of said new county shall elect all county officers for said county, except as hereinafter excepted, who shall be commissioned and qualified in the same manner as such officers are in other counties in this State, and who shall continue in office until the next regular election for such officers, and until their successors are elected and qualified, and who shall have all the jurisdiction and perform all the duties which are or may be conferred upon such officers in other counties of this State.
55 ILCS 5/1-3002