From the record
“The Rankin Ranch is a historic ranch off Montana Highway 284, north of Townsend in rural Broadwater County, Montana. A National Historic Landmark, it was a longtime summer residence of Jeannette Rankin (1880-1973), whose 1916 election to the United States House of Representatives made her the first woman elected to the House.”
Wikipedia article Rankin Ranch, CC BY-SA 4.0.
One of 11 National Register listings published here for Broadwater County · listed in 1976 · category: Building · a National Historic Landmark.
Sources: the Wikipedia article · the case file at the National Archives · the National Register database, National Park Service