Calvin, ND has a population of 9 and is the 28,990th largest city in the United States. The population density is 41 per sq mi which is 315% higher than the North Dakota average and 55% lower than the national average. The median age in Calvin is 54 which is approximately 52% higher than the North Dakota average of 35. In Calvin, 100% of the population over 15 years of age are married, 78% speak English and 22% speak Spanish. 78% of Calvin residents were born in North Dakota, 22% were born out of state, 0% were born outside of the United States and 0% were foreign born.