Colesburg, IA has a population of 462 and is the 20,031st largest city in the United States. The population density is 1,593 per sq mi which is 2816% higher than the Iowa average and 1658% higher than the national average. The median age in Colesburg is 45 which is approximately 19% higher than the Iowa average of 38. In Colesburg, 70% of the population over 15 years of age are married, 100% speak English and 0% speak Spanish. 90% of Colesburg residents were born in Iowa, 10% were born out of state, 0% were born outside of the United States and 0% were foreign born.