De Borgia is an unincorporated community and census-designated place (CDP) in Mineral County, Montana, United States.

[4] De Borgia is located in northwestern Mineral County on the north side of Interstate 90, with access via exit 18.

According to the U.S. Census Bureau, the De Borgia CDP has a total area of 2.7 square miles (7.0 km2), all land.

26.5% of all households were made up of individuals, and 8.8% had someone living alone who was 65 years of age or older.

There were 9.1% of families and 19.7% of the population living below the poverty line, including no under eighteens and 8.3% of those over 64.