Colfax, ND has a population of 148 and is the 25,712th largest city in the United States. The population density is 147 per sq mi which is 1382% higher than the North Dakota average and 62% higher than the national average. The median age in Colfax is 37 which is approximately 6% higher than the North Dakota average of 35. In Colfax, 84% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 61% of Colfax residents were born in North Dakota, 39% were born out of state, 0% were born outside of the United States and 0% were foreign born.