County highways in Wisconsin are not county roads. Most people have posted using the correct CTH acronym. For generations, county highways were called county trunks (County Trunk A), with CTH A, County A, or County Highway A also used. However, County Road is incorrectly used due to the incorrect addressing by the USPS (when did the post office ever have jurisdiction over or maintain county highways?), and also by Google et. al., and people from surrounding states that call them county roads.
Having not traveled extensively in Wisconsin, and definitely not off the signed Interstate, US, and state route system, I ask: Are all county highways designated with the "County X" black-on-whilte-in-a-square-with-rounded-corners marker? Or is there a difference between levels of maintenance and funding the way there is in neighboring Minnesota, where you have county routes signed with two different markers, the standard pentagon, and a black-and-white square, where one designates a CSAH (county state-aid highway) and one doesn't?
The USPS can choose to name a mail delivery route anything it wants to. In some places in Kentucky, those are still called Rural Routes (RR) or Home Contract Routes (HCR). My grandmother's address changed from a RR, where mail was addressed to "Rt. X Box XXX," to a HCR, where the mail was addressed to "HCR X, Box XXX."
When my county instituted a 911 system, they did an exhaustive study of roads and when duplicate names were found, the appropriate government body (city or county) was asked to eliminate the duplicates. State-maintained routes were named with the route number, and if appropriate, the direction of travel. "Highway 52 West" and "Highway 52 East" going out of the county seat; other routes being differentiated directionally if there was a concurrency. ("Highway 708 North" and Highway 708 South," based on a concurrency with KY 52.) The post office adopted those 911 names as its official routings.
In Breathitt County, however, delivery addresses are mostly based on names. KY 52 runs west from its terminus at KY 30, near Jackson. Its post office and 911 name isn't "Highway 52" or "Highway 52 West." It's "Beattyville Road."
Correct me if I'm wrong, but wouldn't a "county highway" and a "county road" be the same thing unless the terms are used differently to distinguish between funding sources?
Also, aren't some of Missouri's lettered state secondary routes so "numbered" for special reasons?