Lena, IndianaLena is an unincorporated town in southern Jackson Township, Parke County, in the U.S. state of Indiana. A portion of Lena also extends into Clay County, just north of Carbon. This portion of Lena is referred to as Marysville.HistoryLena was platted in 1870 when the railroad was extended to that point; by 1913 it had a population of around 300. A post office was established at Lena in 1880, and remained in operation until it was discontinued in 1936.