Milnor is a city in Sargent County, North Dakota in the United States. The population was 653 at the 2010 census. Milnor was founded in 1883.
Milnor is located at 46°15′30″N 97°27′21″W / 46.25833°N 97.45583°W / 46.25833; -97.45583 (46.258208, -97.455834).
According to the United States Census Bureau, the city has a total area of 1.0 square miles (2.6 km²), of which, 0.9 square miles (2.4 km²) of it is land and 0.1 square miles (0.2 km²) of it (7.00%) is water.