Arthur, IndianaArthur or Arthur Junction due to its location at the junction of Indiana 61 and Indiana 64, is a Census designated place in Patoka Township, Pike County, in the U.S. state of Indiana.HistoryA post office was established at Arthur in 1873, and remained in operation until 1903. The community was named for Arthur Thompson, an early settler.DemographicsThe United States Census Bureau delineated Arthur as a census designated place in the 2022 American Community Survey.