[2] Delaware was platted in 1860, shortly after the Dubuque and Pacific Railroad was built through the neighborhood.

[5] As of the census of 2020,[7] there were 142 people, 72 households, and 42 families residing in the city.

There were 72 housing units at an average density of 98.7 per square mile (38.1/km2).

Hispanic or Latino persons of any race comprised 4.2% of the population.

There were 85 housing units at an average density of 106.3 per square mile (41.0/km2).

40.2% of all households were made up of individuals, and 18.3% had someone living alone who was 65 years of age or older.

There were 78 housing units at an average density of 97.7 per square mile (37.7/km2).

26.9% of all households were made up of individuals, and 11.5% had someone living alone who was 65 years of age or older.

None of the families and 4.4% of the population were living below the poverty line, including no under eighteens and 16.7% of those over 64.