Rosanky is a census designated place (CDP) located on Farm to Market Road 535 in southern Bastrop County, Texas, United States. As of the 2020 census, Rosanky had a population of 1,473. Rosanky has a post office, with the ZIP code 78953. The town is named for Ed Rosanky, who emigrated from Prussia and settled in the area in 1854.
The climate in this area is characterized by hot, humid summers and generally mild to cool winters. According to the Köppen Climate Classification system, Rosanky has a humid subtropical climate, abbreviated "Cfa" on climate maps.
Rosanky first appeared as a census designated place in the 2020 U.S. census.
The community is in the Smithville Independent School District, which operates Smithville High School.