No longer assigned; Route 29 was the original number for what is now Route 124 in Darien and New Canaan.

Route 29 was commissioned in 1932, and is shown following parts of routes 123 and 124 from Norwalk to the New York state line:

• Riverside Avenue, from US 1 in Norwak to New Canaan Avenue. This became part of Route 123 after Route 29 was moved, and is now SR 809.
• New Canaan Avenue and Norwalk Road, to East Avenue in New Canaan. This is part of today's Route 123.
• East Avenue (probably) to Main Street, New Canaan (now part of Route 106)
• Today's Route 124 to the state line

By 1934, Routes 29 and 123 had switched places south of New Canaan, with Route 29 starting in Darien instead of Norwalk. Its length at that time was 9.44 miles.

In 1945, there was an adjustment in New Canaan where a portion of South Avenue was deleted and a section of Oenoke Ridge Road was added to Route 29. In 1963 a similar switch was made to Cherry Street from South Avenue. I'm sorry that I don't have more details here.

In 1966, Connecticut and New York fixed a few such discontinuities at their border:

• CT 4 to NY 361: a short segment of CT 4 became CT 361
• CT 33 to NY 116: a short segment of CT 33 became CT 116
• CT 29 to NY 394: both segments become Route 124

By 1970, however, New York had eliminated its segment of Route 124 leading to the state line, although the highway still exists further north.