Trosky is a city in Pipestone County, Minnesota, United States. The population was 98 at the 2020 census. Trosky was platted in 1884. T…Trosky is a city in Pipestone County, Minnesota, United States. The population was 98 at the 2020 census. Trosky was platted in 1884. The origin of the name Trosky is obscure. A post office has been in operation at Trosky since 1884. Trosky was incorporated on June 10, 1893.