Capt. Rodney J. Baxter House
Encyclopedia
Capt. Rodney J. Baxter House is an octagonal house in Barnstable, Massachusetts
Barnstable, Massachusetts
Barnstable is a city, referred to as the Town of Barnstable, in the U.S. state of Massachusetts and the county seat of Barnstable County. Barnstable is the largest community, both in land area and population, on Cape Cod. The town contains seven villages within its boundaries...

 that was built in 1850. It appears to be the only house explicitly credited by the U.S. National Register of Historic Places
National Register of Historic Places
The National Register of Historic Places is the United States government's official list of districts, sites, buildings, structures, and objects deemed worthy of preservation...

 (NRHP) to having been designed by Orson S. Fowler that both survives and is listed on the National Register. Orson Fowler is known for having advocated octagonal house design, promoted through an architectural pattern book The Octagon House, A Home for All that he wrote and which was the basis for designs of numerous houses. It seems this house is explicitly described in Orson Fowler's book, or it explicitly follows a design given in that book. Other houses built according to Fowler's designs also survive and are listed on the NRHP.

To quote in full about this house from the NRHP's Barnstable Multiple Resource Assessment (page 27, of a document in the public domain):
It was listed on the NRHP in 1987.
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