- Machinery, Supplies & Equipment - Business Supplies Related, Johnstown
- Machinery, Supplies & Equipment - Construction & Contractor Related, Johnstown
- Mailing, Delivery & Courier Service, Johnstown
- Major Appliances, Johnstown - Household & Kitchen
- Management Consultants & Services, Johnstown
- Manicurists & Pedicurists, Johnstown
- Manufacturing, Johnstown
- Manufacturing Products, Johnstown
- Marine Supplies & Equipment, Johnstown - Boat Supplies
- Marriage & Family Counselors, Johnstown
- Martial Arts & Self Defense Schools, Johnstown
- Masonry Materials & Supplies, Johnstown
- Massage Therapists & Professional, Johnstown
- Massage Therapy, Johnstown
- Medical & Dental Management, Johnstown
- Medical Management & Business Administration Service, Johnstown
- Men's Clothing Stores, Johnstown - Clothes & Accessories
- Merchandise Sales Events, Johnstown
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- Methodist Church, Johnstown
- Mexican Restaurants, Johnstown
- Mini & Self Storage, Johnstown
- Miscellaneous Household Item Repair, Johnstown
- Miscellaneous Business Services, Johnstown
- Miscellaneous Government, Johnstown
- Miscellaneous Personal Services, Johnstown
- Miscellaneous Professional, Johnstown
- Mobile Home Parks & Communities , Johnstown
- Modular & Mobile Homes For Sale, Johnstown - Manufactured Homes Sale & Service
- Mortgage Bankers & Correspondents, Johnstown
- Mortgage Brokers, Johnstown
- Mortgage Companies, Johnstown
- Mortgage Feasibility Consultants, Johnstown
- Mortgages & Loans, Johnstown
- Motor Vehicle, Johnstown
- Motor Vehicle Rental & Leasing, Johnstown
- Moving Companies, Johnstown
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