 The first segment of MD 406 was constructed as a concrete road from MD 413 at Hudson Corner east to Corntrack Road in 1929 and 1930.The original segment of MD 406 and the remainder of Rehobeth Road were relocated to the modern alignment, paved, and widened to in 1953 and 1954.MD 667 north of Hudson Corner was transferred to county maintenance and the route assumed all of MD 406 from Hudson Corner to US 13 in 1961.