- Dairy Farms, Altoona
- Dairy Products - Wholesale & Retail, Altoona
- Dance Companies, Altoona
- Day Spas, Altoona
- Debt Adjusters, Altoona
- Debt Consolidation, Altoona
- Debt Management Assistance & Services, Altoona
- Deck Cleaning & Restoration, Altoona - Clean & Seal Decks, Patios, Fences, etc
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Altoona
- Decorating & Designing Services, Altoona
- Decorations Holiday, Altoona
- Delicatessen Restaurants, Altoona
- Demolition Consultants, Altoona - Demolition Contractors
- Demolition Work, Altoona
- Denomination, Non-Denominational, Etcetera, Altoona
- Dental Consultants, Altoona
- Dental Laboratories, Altoona
- Dentists, Altoona
- Dentures, Altoona
- Department Stores, Altoona
- Dermatologists, Altoona - Skin Doctors, Physicians & Surgeons (Dermatology)
- Development Consultants & Management, Altoona
- Developmental Children Services, Altoona
- Developmental Disabilities, Altoona
- Developmentally Disabled Information & Services, Altoona
- Dialysis Clinics, Altoona - Kidney Dialysis Centers
- Diamonds & Precious & Semi-Precious Stones, Altoona
- Diesel Engine, Altoona
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- Digital Printing & Imaging Service, Altoona
- Diner Restaurants, Altoona
- Direct Mail Advertising Services, Altoona
- Disability And Social Security Attorneys & Lawyers, Altoona
- Disc Jockeys, Altoona
- Discount Stores, Altoona - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Altoona
- Divorce & Family Law Attorneys & Lawyers, Altoona
- Doctorate Degree, Altoona
- Doctors, Physicians & Surgeons, Altoona
- Donuts, Altoona
- Door & Gate Operating Devices, Altoona
- Door Glass & Mirrors, Altoona
- Door Installation & Repair, Altoona - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Doors & Door Frames, Altoona - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Altoona
- Drainage Contractors, Altoona - Install & Repair Drainage Systems
- Drinking Establishments, Altoona
- Drive Shafts, Altoona
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Altoona
- Dry Cleaning & Laundry, Altoona - Dry Cleaners
- Dryers Sales, Service & Repair, Altoona - Gas & Electric
- Drywall, Insulation & Plaster Contractors, Altoona - Installation & Repair Services
- Duct Work & Duct Supplies & Equipment, Altoona
- DUI Attorneys & Lawyers, Altoona - DWI - Drunk Driving
- DUI Attorneys & Lawyers, Altoona - DWI - Drunk Driving
- DUI Lawyers & Attorneys, Altoona - DWI - Drunk Driving
- Dutch Restaurants, Altoona
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