The Rock Island County Geographic Information System (GIS) Department assigns all addresses within unincorporated areas. The Department will need a site layout showing property boundaries, where your driveway lies in relation to the main road and if your home is visible from the road. (Under most circumstances, you can usually obtain your address the same day you bring in your site layout).
If your new home is located within the jurisdiction of a municipality, you will need to contact that municipality to obtain an address.