MA 23

NY line in Egremont to Woronoco via Great Barrington.

Cosigned with US 7 through Great Barrington.
Brief multiplex with MA 8 in Otis.

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.

Mark Sinsabaugh's NY 23 entry