- Dams, Waterways, & Docks Contractors, Marathon
- Decorating & Designing Services, Marathon
- Delicatessen Restaurants, Marathon
- Dentists, Marathon
- Department Stores, Marathon
- Dermatologists, Marathon - Skin Doctors, Physicians & Surgeons (Dermatology)
- Diesel, Marathon - Engine Fuels, Oils & Lubricants
- Diesel Engine, Marathon
- Direct Magazine Sales & Delivery, Marathon
- Direct Mail Advertising Services, Marathon
- Discount Stores, Marathon - Clothing, Grocery, Furniture, Etc
- Diving Equipment & Supplies, Marathon - Scuba & Snorkel Gear & Masks Shops
- Diving Instruction, Marathon
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- Diving Tours & Excursions, Marathon
- Divorce & Family Law Attorneys & Lawyers, Marathon
- Dock Construction - Build & Repair, Marathon - Dock Builders
- Doctorate Degree, Marathon
- Doctors, Physicians & Surgeons, Marathon
- Donuts, Marathon
- Draperies & Curtain Fabric Stores, Marathon
- Drinking Establishments, Marathon
- Dry Cleaning & Laundry, Marathon - Dry Cleaners
- Dumpster Rental, Marathon
- Durable & Non Durable Goods & Products, Marathon
- Durable Goods & Products, Marathon
- Dwelling Operators Except Apartment, Marathon
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