Gladstone, ND has a population of 316 and is the 22,210th largest city in the United States. The population density is 870 per sq mi which is 8693% higher than the North Dakota average and 860% higher than the national average. The median age in Gladstone is 31 which is approximately 13% lower than the North Dakota average of 35. In Gladstone, 62% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 66% of Gladstone residents were born in North Dakota, 33% were born out of state, 1% were born outside of the United States and 0% were foreign born.