Naperville is the biggest and most mixed service area on the list. Newer subdivisions bring straightforward work — aluminum and iron fence repair, railing sections, gates that have sagged out of square. The older stock closer to the river brings the more interesting jobs, where original ironwork is worth repairing properly rather than swapping out.
Commercially it is retail, restaurants and light industrial: handrail and guardrail repair that has to pass inspection, dock and bollard work, and fabrication that has to be installed after hours so a business does not lose a day.
Straight answer: Naperville is the far end of the service area, so jobs here get grouped where possible. Flexible on the day usually means a better price and a faster slot.