Ligonier is a city in Perry Township, Noble County, in the U.S. state of Indiana. The population was 4,568 at the 2020 census. Ligonier was …Ligonier is a city in Perry Township, Noble County, in the U.S. state of Indiana. The population was 4,568 at the 2020 census. Ligonier was platted in 1835. The city was named after the Pennsylvanian borough of the same name. A post office has been in operation at Ligonier since 1848.