NY line in Egremont to Woronoco via Great Barrington.
See the entry for MA 17 for details on the route numbering; Rt 23 first appears on my 1939 map from the NY line to Woronoco. The route is still the same now.
[flickr-gallery mode=”search” tags=”MA 23″ user_id=”80252055@N02″]
Mark Sinsabaugh’s NY 23 entry