- Dallas Center (Population: 1,595)
- Davenport (Population: 98,359)
- De Soto (Population: 1,009)
- De Witt (Population: 5,049)
- Decorah (Population: 8,172)
- Denison (Population: 7,339)
- Denver (Population: 1,627)
- Des Moines (Population: 198,682)
- Dubuque (Population: 57,686)
- Dunlap (Population: 1,139)
- Durant (Population: 1,677)
- Dyersville (Population: 4,035)
- Dysart (Population: 1,303)
