I grew up in Union County. I live in GA now. My finds there include all the herps you have seen and several Eastern milks, ringnecks, Ribbon snakes , wood frogs, slimy salamanders and 3 toed (?) sallies (they have a constricting ring around their tail) . I also know of several Northern copperheads found in Watchung res. Email me privately.
Other Jersey finds include Wood turtles,red - bellied snakes, smooth greens, black racer's , carpenter frogs and grey treefrogs.