- Dance Companies, Canonsburg
- Data Communications Service, Equipment, Supplies & Sales, Canonsburg
- Data Processing Equipment & Supplies , Canonsburg
- Data Processing Services, Canonsburg
- Day Spas, Canonsburg
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Canonsburg
- Decorating & Designing Services, Canonsburg
- Delicatessen Restaurants, Canonsburg
- Demolition Consultants, Canonsburg - Demolition Contractors
- Demolition Work, Canonsburg
- Denomination, Non-Denominational, Etcetera, Canonsburg
- Dental Bonding & Cosmetic Dentistry, Canonsburg - Cosmetic Dentist & Tooth Bonding
- Dental Clinics, Canonsburg
- Dental Spas, Canonsburg
- Dental Spas, Canonsburg
- Dental Supplies & Equipment, Canonsburg
- Dentists, Canonsburg
- Department Stores, Canonsburg
- Dermatologists, Canonsburg - Skin Doctors, Physicians & Surgeons (Dermatology)
- Diabetes Help Groups, Canonsburg
- Diabetes Services & Supplies, Canonsburg - Educational, Referral & Support Service Centers
- Dialysis Clinics, Canonsburg - Kidney Dialysis Centers
- Die Casting, Canonsburg
- Digital Printing & Imaging Service, Canonsburg
- Digital Video Disc (Dvd) Duplication, Canonsburg
- Digital Video Disc (Dvd) Production, Canonsburg
- Diner Restaurants, Canonsburg
- Direct Magazine Sales & Delivery, Canonsburg
- Direct Mail Advertising, Canonsburg
- Direct Mail Advertising Services, Canonsburg
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- Direct Marketing, Canonsburg
- Direct Selling Businesses, Canonsburg
- Disability And Social Security Attorneys & Lawyers, Canonsburg
- Disc Jockeys, Canonsburg
- Discount Stores, Canonsburg - Clothing, Grocery, Furniture, Etc
- Dispensing Machines, Canonsburg
- District Judges, Canonsburg
- Diving Equipment & Supplies, Canonsburg - Scuba & Snorkel Gear & Masks Shops
- Divorce & Family Law Attorneys & Lawyers, Canonsburg
- Doctorate Degree, Canonsburg
- Doctors, Physicians & Surgeons, Canonsburg
- Doll Houses, Canonsburg
- Dolls, Doll Houses & Accessories , Canonsburg
- Donuts, Canonsburg
- Door & Gate Operating Devices, Canonsburg
- Door Glass & Mirrors, Canonsburg
- Doors & Door Frames, Canonsburg - Exterior, Interior, French, Front Entry, Patio, Storm, Garage & Sliding Glass Doors
- Drafting Services, Canonsburg
- Drama Schools, Canonsburg
- Drilling & Boring Equipment & Supplies, Canonsburg
- Drinking Establishments, Canonsburg
- Drug Screening Services, Canonsburg
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Canonsburg
- Dry Cleaning & Laundry, Canonsburg - Dry Cleaners
- Dryers Sales, Service & Repair, Canonsburg - Gas & Electric
- DUI Attorneys & Lawyers, Canonsburg - DWI - Drunk Driving
- Dump Truck, Canonsburg
- Durable & Non Durable Goods & Products, Canonsburg
- Durable Goods & Products, Canonsburg
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