41° 6' 33.410" N / 73° 59' 44.592" W
NOT IN NEW JERSEY
Dave van Ronk was no idiot, and while we would love to have the chance to pick his brain on this one, our best guess is that Bardonia is a little Easter Egg buried amongst his flurry of place names in the Stomp. Perhaps he was curious to see if anyone called him out on throwing a clearly New York town in the mix.
Whether he slipped it in as a joke or just had a really inaccurate map, this one bugged the heck out of us. We dug so, so deep to see if there was ever a Bardonia in New Jersey that may have been incorporated into another town ages ago. No such luck.
Hopefully we got this right, and Dave's having a laugh on the other side.