- Diagnostic center
- Data entry service
- Domestic services
- Day care center
- Doll store
- Department of Social Services
- Dry wall supply store
- Disposable tableware supplier
- Debris removal service
- Dry wall contractor
- Door warehouse
- Debt collection agency
- Debt collecting
- Desktop publishing service
- Detective
- Dental supply store
- Department of Transportation
- Diesel engine dealer
- Drilling equipment supplier
- Dating service