Naperville and Libertyville: the Illinois side
Naperville is the giant of the four, large enough to behave like its own city, with a professional-services and healthcare economy to match, and competitive enough that precision matters: the openings are in specific services and neighbourhoods, which the keyword data locates exactly. Libertyville is smaller, wealthier per capita, and noticeably softer online; established businesses there often have reputations that far exceed their visibility, which is the cheapest gap in marketing to close.
Brookfield and Wauwatosa: the Wisconsin side
Milwaukee's western suburbs pair steady family-service demand with a maker-and-remodeler economy suited to the housing stock. Wauwatosa adds a medical corridor that shapes its search market, and both towns share the Midwest pattern we see everywhere: strong businesses, weak websites, and map packs still open to whoever completes the fundamentals first.
One case study of the corridor approach covers all four towns, because the method is the region's: one strong regional strategy, real local sections, and none of the thin per-town duplication that this corridor's agencies still sell. The same rule we apply in the Kansas City metro applies here.