Ida Grove is a city in Ida County, Iowa, United States. The population was 2,051 at the time of the 2020 census. It is the county seat of Ida County.

Iowa Highway 175 (Iowa 175) is a main east–west route in the northern portion of the state. The highway has a length of 221 miles (356 km). Iowa Highway 175 enters the state by a Missouri River crossing between Decatur, Nebraska and Onawa. The highway continues westward as Nebraska Highway 51. Iowa 175's eastern terminus is at a T intersection with U.S. Highway 63 (US 63) in southwestern Black Hawk County.