10 ILCS 5/5-19
Only persons residing within the corporate limits of a city, village or incorporated town wherein this Article 5 is in effect, shall be permitted to register in the office of the clerk of the respective city, village or incorporated town in which they reside and then only during the periods provided by Section 5-5 of this Article 5.
Within 24 hours after a person has registered in the office of the clerk of a city, village or incorporated town, the said clerk shall transmit by mail or cause to be delivered to the County Clerk the original and duplicate registration cards of the person who has registered in his office.
Only persons who reside within the limits of a town in a county wherein this Article 5 is in effect shall be permitted to register in the office of the town clerk of the respective towns in which they reside and then only during the periods provided by Section 5-5 of this Article 5.
Within 24 hours after a person not residing within the corporate limits of a city, village or incorporated town has registered in the office of a town clerk, the town clerk shall transmit by mail or cause to be delivered to the county clerk the original and duplicate cards of the person who has registered in his office. Within 24 hours after a person who resides within the limits of a city, village or incorporated town has registered in the office of a town clerk, the town clerk shall transmit by mail or cause to be delivered the original and duplicate cards of the person so registered to the county clerk.
Any person residing in the territory wherein this Article 5 is in effect, may register in the office of the county clerk during the hours, and within the periods provided by Section 5-5 of this Article 5.
10 ILCS 5/5-19