- Dakota City
- Dallas Center
- Dana
- Danbury
- Danville
- Davenport
- Davis City
- Dawson
- Dayton
- De Soto
- De Witt
- Decatur City
- Decorah
- Dedham
- Deep River
- Defiance
- Delaware
- Delhi
- Delmar
- Deloit
- Delphos
- Delta
- Denison
- Denmark
- Denver
- Derby
- Des Moines
- Dexter
- Diagonal
- Diamondhead Lake
- Dickens
- Dike
- Dixon
- Dolliver
- Donahue
- Donnan
- Donnellson
- Doon
- Douds
- Dougherty
- Dow City
- Dows
- Drakesville
- Dubuque
- Dumont
- Duncan
- Duncombe
- Dundee
- Dunkerton
- Dunlap
- Durango
- Durant
- Dyersville
- Dysart
