Milnor, ND has a population of 581 and is the 18,633rd largest city in the United States. The population density is 618 per sq mi which is 6148% higher than the North Dakota average and 582% higher than the national average. The median age in Milnor is 46 which is approximately 32% higher than the North Dakota average of 35. In Milnor, 70% of the population over 15 years of age are married, 94% speak English and 5% speak Spanish. 56% of Milnor residents were born in North Dakota, 40% were born out of state, 0% were born outside of the United States and 4% were foreign born.