Jamestown, ND has a population of 15,441 and is the 2,762nd largest city in the United States. The population density is 1,190 per sq mi which is 11932% higher than the North Dakota average and 1213% higher than the national average. The median age in Jamestown is 39 which is approximately 9% higher than the North Dakota average of 35. In Jamestown, 53% of the population over 15 years of age are married, 96% speak English and 1% speak Spanish. 73% of Jamestown residents were born in North Dakota, 25% were born out of state, 0% were born outside of the United States and 2% were foreign born.