Perhaps it would help to know your general area. I have a lot of packages come through Hodgkins IL to Detroit, I'm assuming it is some sort of hub, and from there it is probably just going sorting facility to sorting facility, especially if it is ground service.
Also is it UPS or USPS? Your title says UPS, the text says Post Office. I know UPS and FedEx have agreements with USPS to do first/last mile services, which generally adds a few stops. Think all my Nashbar free shipping goes that way.