Question: In which county of Montana is the Historic St. Mary's Mission located? 

full_context: Document 1: St. Mary's Mission (Montana): The Historic St. Mary’s Mission is a mission established by the Society of Jesus of the Catholic Church; located now on 4th street in modern-day Stevensville, Montana. Founded in 1841 and designed as an ongoing village for Catholic Salish Indians, St. Mary’s was the first permanent settlement made by European descendants in what became the state of Montana. The mission structure was rebuilt in 1866, with it being added to the National Register of Historic Places in 1970.
Document 2: St. Peter's Mission Church and Cemetery: The St. Peter's Mission Church and Cemetery, also known as St. Peter's Mission and as St. Peter's-By-the-Rock is a historic Roman Catholic mission located on Mission Road 10.5 mi west-northwest of the town of Cascade, Montana, United States. The historic site consists of a wooden church and "opera house" and a cemetery. Also on the site are the ruins of a stone parochial school for boys, a stone convent, and several outbuildings.
Document 3: Sainte Marie among the Iroquois: Sainte Marie among the Iroquois (originally known as "Sainte Marie de Gannentaha" or "St. Mary's of Ganantaa") was a 17th-century French Jesuit mission located in the middle of the Onondaga nation of the Haudenosaunee/Iroquois. It was located on Onondaga Lake near modern-day Syracuse, New York. The original mission was in use only from 1656 to 1658.
Document 4: Missoula Metropolitan Area: The Missoula Metropolitan Statistical Area is located in the West-central portion of the state, the 2015 United States Census Bureau put its population at 114,181 making it the 2nd largest metropolitan statistical area in Montana and the 321st largest in the nation between Cleveland, TN and Mount Vernon, WA. As of July 1, 2011 Census estimates put the Missoula Metropolitan Area population at 110,138 making it only the second Metropolitan area in Montana to surpass 110,000 people.
Document 5: St. Ignatius Mission: The St. Ignatius Mission is a landmark Roman Catholic mission founded at its present location, St. Ignatius, Montana, in 1854 by Father Pierre-Jean De Smet and Father Adrian Hoecken. The current mission church was built between 1891 and 1893, and listed on the U.S. National Register of Historic Places in 1973.
Document 6: St. Francis Mission: St. Francis Mission is a Roman Catholic mission complex on the Rosebud Indian Reservation in St. Francis, South Dakota, among the Lakota-Sioux Native Americans. The mission was founded in 1886 by the Jesuits who were welcomed by Bishop Martin Marty, and it soon grew to a large collection of buildings. Most of these were destroyed by a fire in 1916, but many were soon rebuilt. The mission complex includes 26 buildings, the most prominent of which are St. Charles Borromeo Church and the 1916 Drexall Hall, the latter a multifunction structure providing classrooms, meeting spaces, and residential spaces. The complex also includes one of two known copies of a statue of Kateri Tekakwitha by Joseph-Émile Brunet. The complex was listed on the National Register of Historic Places in 1975.
Document 7: Stevenson Ranch, California: Stevenson Ranch is a census-designated place in Los Angeles County, California. The community is located in the Santa Clarita Valley. Often incorrectly referred to as part of the city of Santa Clarita, the community does not actually fall within the Santa Clarita city limits and is instead in an unincorporated area. Stevenson Ranch encompasses about 6.4 mi2 . About 1000 acre are set aside as parks, recreation areas, and open space. Stevenson Ranch is set in the foothills of the Santa Susana Mountains and lies west of Interstate 5. This area backs up to the historic, oil-mining town of Mentryville, founded in 1875. A master-planned community, it was approved by the county in 1987. The population was 17,557 at the time of the 2010 census.
Document 8: Flathead County, Montana: Flathead County is a county located in the U.S. state of Montana. As of the 2010 census, the population was 90,928, making it the fourth-most populous county in Montana. Its county seat is Kalispell. The numerical designation for Flathead County (used in the issuance of license plates) is 7. It is south from the Canada–US border of British Columbia.
Document 9: Bonner-West Riverside, Montana: Bonner-West Riverside (Salish: Nʔaycčstm, "Place of the Big Bull Trout") is a census-designated place (CDP) in Missoula County, Montana, United States. It is part of the Missoula, Montana Metropolitan Statistical Area. The population was 1,663 at the 2010 census, a decline from its population of 1,693 in 2000.
Document 10: St. Mary's Cathedral, Ranchi: St. Mary's Cathedral is the first church of the centuries-old history of this tribal town Ranchi, In the Chota Nagpur Plateau area. Catholics and Christian faithful working as Tea tribes in Tea Estates this area, Railway along with the farmers were the early community of the church. Schools, orphanage, mission centers and other institutions start building gradually to meet the growing demands of the community of vibrant ethnic culture.
Document 11: St. Ignace Mission: The St. Ignace Mission is located in a municipal park known as Marquette Mission Park. It was the site of a mission established by Père Jacques Marquette, and the site of his grave in 1677. A second mission was established at a different site in 1837, and the chapel was moved here in 1954. The second mission chapel is the oldest Catholic church in Michigan and Wisconsin. The St. Ignace Mission was designated a Michigan State Historic Site in 1956, and was declared a U.S. National Historic Landmarks in 1960, one of the earliest sites recognized. The mission chapel serves as the Museum of Ojibwa Culture.
Document 12: Silver Bow County, Montana: Silver Bow County is a county in the State of Montana. As of the 2010 census, the population was 34,200. Its county seat is Butte. In 1977, the city and county governments consolidated to form the single entity of Butte-Silver Bow. Additionally, the town of Walkerville is a separate municipality from Butte and is within the county.
Document 13: St. Ignatius, Montana: St. Ignatius (Salish: snyél̓mn, Ktunaxa: ʔa·kikqǂaǂaǂuk̓pǂiʔit) is a town in Lake County, Montana, United States. The population was 842 at the 2010 census. The town is located on the Flathead Indian Reservation along US 93, and is home to the St. Ignatius Mission which is listed on the National Register of Historic Places.
Document 14: St. Mary's Mission (Kansas): The St. Mary's Mission was a Jesuit mission founded in 1847 along the Oregon Trail. The city of St. Marys, Kansas was established around the mission. During the 19th and 20th centuries Native American children were often forced to attend Mission schools like St. Mary's. Potawatomi children were taken from their families in the 1860s and sent to St. Mary's Mission where they were left in the care of White Americans.
Document 15: Stevensville, Montana: Stevensville (Salish: ɫq̓éɫmlš) is a town in Ravalli County, Montana, United States. The population was 1,809 at the 2010 census.
ground_truth: Ravalli County, Montana