Defined as a village in the western part of Danbury,[2] Mill Plain has also historically been considered a semi-autonomous hamlet.[3] The first home in the area was built around 1720 by Nathaniel Stevens.[4][5] By 1725 Samuel Castle had built his second grist mill, located in this section of town, which gave rise to the name Mill Plain.[6] An early mention of Mill Plain is found in a 1769 deed for 20 acres (8.1 ha) of land near a stream "that runs into ye Mill Plain Pond," which is the original name for Lake Kenosia. The area belonged to the town of Ridgefield at that time.[7]
In 1865, resident Henry M. Senior opened a general store and post office. Five years later, Senior built a hat manufacturing shop in the area, which operated until 1892.[8]Mill Plain station, was built in 1881, and closed in 1928 after being acquired by the New York, New Haven and Hartford Railroad.[9]
The post office was operated by the Senior family until the 1940s.[10]
^Devlin, William (1984). We Crown Them All: An Illustrated History of Danbury. Woodland Hills, California: Windsor Publications. p. 11. ISBN0-89781-092-9.
^Sanders, Jack (August 30, 2021). "The Ridgefield Encyclopedia"(PDF). Ridgefieldlibrary.org. Ridgefield Library. Retrieved February 22, 2022.