New Sarpy is a census-designated place in St. Charles Parish, Louisiana, United States. The population was 1,169 at the 2020 census. In 1699, Pierre Le Moyne d'Iberville and Jean-Baptiste Le Moyne de Bienville discovered an indigenous Bayagoula settlement located near the Mississippi River intersection with a tributary in present-day New Sar…New Sarpy is a census-designated place in St. Charles Parish, Louisiana, United States. The population was 1,169 at the 2020 census. In 1699, Pierre Le Moyne d'Iberville and Jean-Baptiste Le Moyne de Bienville discovered an indigenous Bayagoula settlement located near the Mississippi River intersection with a tributary in present-day New Sarpy. The site was named L’Anse aux Outardes or Bustard’s Cove.