- Dagenham - 38 companies
- Dagnell - 1 company
- Dalbeattie - 2 companies
- Dalgety Bay - 1 company
- Dalkeith - 14 companies
- Dallas - 1 company
- Dalry - 1 company
- Daresbury - 1 company
- Darlaston - 5 companies
- Darley Abbey - 1 company
- Darlington - 77 companies
- Darlington, - 1 company
- Dartford - 134 companies
- Dartmouth - 3 companies
- Darvel - 1 company
- Darwen - 34 companies
- Datchet - 1 company
- Datchworth - 1 company
- Daventry - 87 companies
- Daventry Northants - 1 company
- Dawlish - 3 companies
- Deal - 8 companies
- Deansgate - 1 company
- Deansgrange - 1 company
- Deanston - 1 company
- Debenham - 1 company
- Deeside - 60 companies
- Delabole - 3 companies
- Delph - 1 company
- Denbigh - 9 companies
- Denbighshire - 8 companies
- Denham - 2 companies
- Denmark - 1 company
- Denmead - 1 company
- Denny - 5 companies
- Denton - 1 company
- Deptford - 1 company
- Derby - 315 companies
- Derbys - 1 company
- Derbyshire - 103 companies
- Dereham - 24 companies
- Derry - 2 companies
- DEVIZES - 35 companies
- Devizes Wiltshire - 1 company
- Devon - 91 companies
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