Colesburg
- County:
- Delaware County
- County Seat:
- No
- Area (mi²):
- 0.294
- State:
- Iowa
Colesburg is a city located in Delaware County, Iowa. Colesburg has a 2026 population of 379. Colesburg is currently declining at a rate of -0.79% annually and its population has decreased by -1.56% since the most recent census, which recorded a population of 385 in 2020.