De Borgia, MT

De Borgia is an unincorporated community and census-designated place in Mineral County, Montana, United States. The 2020 census counted 91 residents. The town derives its name from the St. Regis River, which was named after Saint Regis DeBorgia, a Catholic missionary. The post office was established in 1900. The short version is that De Borgia carries an earlier story into the places people know and use now. That is the local read on De Borgia: its past remains attached to the places people use now. De Borgia is located in northwestern Mineral County on the north side of Interstate 90, with access via exit 18. The St. Regis River passes to the south of the highway, flowing southeasterly to join the Clark Fork at St. Regis. De Borgia includes the town derives its name from the St. Regis River.