This made me wonder if there are any locations in the U.S. where 5 or more counties meet at a single geographic point? If so, where?
Lake Okeechobee in Florida is the best known location in the US where this happens, according to the Twelve Mile Circle website:
Looking at Lake Okeechobee on this Microsoft Encarta map clearly shows a point where five different Florida counties come together at a single point: Glades; Hendry; Palm Beach, Martin and Okeechobee. There is no other spot in the United States where this occurs.
The blog states that this is the only location in the US; as far as we can tell that's correct, even though Ron Maupin found another near-occurrence in Texas.
There are five counties in Florida that meet in the middle of Lake Okeechobee.
I haven't been able to find more, but the Wikipedia article implies that there may be more.