Stennett, IowaStennett is an unincorporated community in Montgomery County, Iowa, United States. Stennett is located at the junction of County Highways H20 and M55, north-northeast of Red Oak.HistoryStennett got its start in the year 1880 when a railroad switch was built through the territory to reach the Stennett stone quarry. Stennett's population was 28 in 1902, and 95 in 1925. The population was 25 in 1940.