- Hair Care Professionals, Potomac
- Hamburger Restaurants, Potomac
- Handicapped Services, Potomac
- Hardware Stores, Potomac
- Health & Fitness Program Consultants & Trainers, Potomac
- Health & Medical, Potomac
- Health And Medical Centers, Potomac
- Health Care Information & Services, Potomac
- Health Care Plans, Potomac
- Health Clubs & Gymnasiums, Potomac
- Health Insurance, Potomac
- Healthcare Providers, Practitioners & Professionals, Potomac
- Heating & Air Conditioning Repair, Installation & Service Contractors, Potomac - HVAC Contractors
- Hindu Churches, Potomac
- Historical Restoration, Potomac
- Hobby & Model Shops & Supplies, Potomac
- Holding Companies, Potomac
- Home Additions & Remodeling Contractors, Potomac - Refinishing & Restoration
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- Home Appliance Repair, Sales & Services, Potomac
- Home Decor Stores, Potomac - Home Decorations, Supplies & Accessories
- Home Furnishings, Potomac - Home Decor Stores, Items & Accessories
- Home Health Care, Potomac - Agencies & Services
- Home Security Companies & Services, Potomac - Home Alarm Systems & Security Systems, Video Surveillance System, Etc
- Homes Mentally Handicapped, Potomac
- Horse Stables, Potomac
- Hospital & Medical Insurance Plans, Potomac
- Hospital, Dental & Medical Equipment & Supplies, Potomac
- Hospitals, Potomac
- Hot Dog Restaurants, Potomac
- Hotel & Motel Management Consultants, Potomac
- House & Apartment Cleaning, Potomac
- House Cleaning & Maid Service, Potomac
- Household & Commercial Appliances Stores, Potomac
- Household Goods & Furniture Storage , Potomac
- Household Services, Potomac
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