- Machinery, Supplies & Equipment - Business Production Related, Williamstown
- Machinery, Supplies & Equipment - Business Supplies Related, Williamstown
- Mailbox Rental Services, Williamstown
- Mailing, Delivery & Courier Service, Williamstown
- Major Appliances, Williamstown - Household & Kitchen
- Management Consultants & Services, Williamstown
- Manufacturing, Williamstown
- Manufacturing Products, Williamstown
- Marriage & Family Counselors, Williamstown
- Martial Arts & Self Defense Schools, Williamstown
- Masonry Materials & Supplies, Williamstown
- Massage Therapists & Professional, Williamstown
- Massage Therapy, Williamstown
- Meeting & Event Planning Services, Williamstown - Conference Consultants
- Membership Sports & Recreation Clubs, Williamstown
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- Mental Health Specialists, Williamstown - Psychologist, Psychiatrist, Psychotherapist, etc
- Methodist Church, Williamstown
- Mexican Restaurants, Williamstown
- Miscellaneous Government, Williamstown
- Miscellaneous Professional, Williamstown
- Mortgage Bankers & Correspondents, Williamstown
- Motor Vehicle, Williamstown
- Motor Vehicle Rental & Leasing, Williamstown
- Motorcycle Parts, Accessories & Dealers, Williamstown
- Movie Theaters, Williamstown
- Moving & Storage Supplies & Equipment, Williamstown
- Moving Companies, Williamstown
- Moving Truck Rental , Williamstown
- Museums, Williamstown
- Music, Williamstown
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