A post office called West Town was established in 1816, the name was changed to Westtown in 1894, and the post office remains in operation. The community was named for its location on the west side of the town of Minisink.
- U.S. Geological Survey Geographic Names Information System: Westtown, New York
- "Post Offices". Jim Forte Postal History. Retrieved 10 March 2018.
- Eager, Samuel Watkins (1846). An Outline History of Orange County: Together with Local Tradition and Short Biographical Sketches of Early Settlers, Etc. T. E. Henderson. p. 417.
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