- Machine Shop & Tool Repair Service, Swansea
- Machinery, Supplies & Equipment - Construction & Contractor Related, Swansea
- Manicurists & Pedicurists, Swansea
- Manufacturing, Swansea
- Manufacturing Products, Swansea
- Masonry Materials & Supplies, Swansea
- Membership Sports & Recreation Clubs, Swansea
- Metal Buildings, Swansea - Kits, Homes, Steel Buildings, etc
- Methodist Church, Swansea
- Mexican Restaurants, Swansea
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- Ministries Church, Swansea
- Miscellaneous Government, Swansea
- Miscellaneous Professional, Swansea
- Mortgages & Loans, Swansea
- Motor Vehicle, Swansea
- Motor Vehicle Rental & Leasing, Swansea
- Motorcycle Parts, Accessories & Dealers, Swansea
- Moving Truck Rental , Swansea
- Muffler Shop & Exhaust Systems, Swansea
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