Not surprised at all that MoCo and Hunterdon remain on the list. Somerset may have small areas that are lower middle class (Manville, Somerville, and parts of Franklin Township), but lacks a larger city such as Hackensack to drag it down a la Bergen County (which would be near the top of the list if you gave the area of the county south of Paramus to either Essex or Hudson Counties).
Yep...thanks for the ping. Three of the top ten in NJ...between MD, VA and NJ, that’s a big part of the list.