Tocsin, IndianaTocsin is an unincorporated community in Lancaster Township, Wells County, in the U.S. state of Indiana. It is on the border with Jefferson Township.HistoryTocsin was platted in 1884. A post office was established at Tocsin in 1882, and remained in operation until it was discontinued in 1966.DemographicsThe United States Census Bureau defined Tocsin as a census designated place in the 2022 American Community Survey.