Vaughnsville ( VAWNZ-vil) is an unincorporated community and census-designated place in southern Sugar Creek Township, Putnam County, Ohio, United States. Although it is unincorporated, it has a post office, with the ZIP code of 45893. It lies along State Route 115 at its intersection with State Routes 12 and 189. Sugar Creek flows along the west and south of Vaughnsville..
Vaughnsville was originally called Monterey, and under the latter name was laid out in 1847. An addition was made by Daniel C. Vaughn, who gave the town his name. A post office called Vaughnsville has been in operation since 1848.
Vaughnsville's most unusual claim to fame is the first location in the World to use individual communion cups for the Lord's Supper. Though contested. John G. Thomas—a physician and pastor of the Vaughnsville Congregational Church—designed a communion outfit after noticing "a communicant with a diseased mouth condition". Thomas applied for a patent for his invention on August 2, 1893, in which he wrote that he "invented certain new and useful improvements in communion service" which would "provide an individual or separate cup for the use of each person at the celebration of the Lord’s Supper, commonly called the communion service…" (Serial No.