- Machine Shop & Tool Repair Service, Warrenton
- Machinery, Supplies & Equipment - Business Supplies Related, Warrenton
- Magazine & Newspaper Stands, Warrenton - Dealers & Distributors
- Mailbox Rental Services, Warrenton
- Mailing, Delivery & Courier Service, Warrenton
- Major Appliances, Warrenton - Household & Kitchen
- Management Consultants & Services, Warrenton
- Manicurists & Pedicurists, Warrenton
- Manufacturing, Warrenton
- Marinas & Marina Services, Warrenton
- Marine Products And Services, Warrenton
- Marine Repair & Service Stations, Warrenton
- Marine Supplies & Equipment, Warrenton - Boat Supplies
- Marine Supplies & Equipment Repair, Warrenton - Boat Supplies & Equipment
- Marriage & Family Counselors, Warrenton
- Masonry Materials & Supplies, Warrenton
- Meat Market, Wholesale & Products, Warrenton
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- Medical Supplies & Equipment, Warrenton
- Membership Sports & Recreation Clubs, Warrenton
- Methodist Church, Warrenton
- Mexican Restaurants, Warrenton
- Miscellaneous Business Product Repair, Warrenton
- Miscellaneous Government, Warrenton
- Miscellaneous Industry, Warrenton
- Miscellaneous Personal Services, Warrenton
- Miscellaneous Professional, Warrenton
- Mission Churches, Warrenton
- Mobile Home Parks & Communities , Warrenton
- Motor Vehicle, Warrenton
- Motor Vehicle Rental & Leasing, Warrenton
- Motorcycle Parts, Accessories & Dealers, Warrenton
- Moving & Storage Supplies & Equipment, Warrenton
- Moving Truck Rental , Warrenton
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