Colesburg is a city in Delaware County, Iowa, United States.

According to the United States Census Bureau, the city has a total area of 0.29 square miles (0.75 km2), all land.

There were 192 housing units at an average density of 654.1 per square mile (252.6/km2).

Hispanic or Latino persons of any race comprised 1.6% of the population.

There were 200 housing units at an average density of 689.7 per square mile (266.3/km2).

29.4% of all households were made up of individuals, and 11.8% had someone living alone who was 65 years of age or older.

There were 198 housing units at an average density of 672.8 per square mile (259.8/km2).

33.5% of all households were made up of individuals, and 21.6% had someone living alone who was 65 years of age or older.