Pillsbury is a city in Barnes County, North Dakota, United States. The population was 12 at the 2020 census. Pillsbury was founded in 1911…Pillsbury is a city in Barnes County, North Dakota, United States. The population was 12 at the 2020 census. Pillsbury was founded in 1911. Pillsbury is located at 47°12′25″N 97°47′26″W / 47.20694°N 97.79056°W.