- Machine Shop & Tool Repair Service, Seagoville
- Machinery Movers & Erectors, Seagoville
- Machinery, Supplies & Equipment - Business Production Related, Seagoville
- Machinery, Supplies & Equipment - Business Supplies Related, Seagoville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Seagoville
- Mailbox Rental Services, Seagoville
- Management Consultants & Services, Seagoville
- Manicurists & Pedicurists, Seagoville
- Manufactured & Mobile Home Movers & Transporting, Seagoville
- Manufacturing, Seagoville
- Martial Arts & Self Defense Schools, Seagoville
- Masonry Materials & Supplies, Seagoville
- Mattresses Renovating, Seagoville
- Mechanical Contractors, Seagoville - Install, Service & Repair
- Methodist Church, Seagoville
- Mexican Restaurants, Seagoville
- Mini & Self Storage, Seagoville
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- Mining, Seagoville
- Miscellaneous Business Product Repair, Seagoville
- Miscellaneous Household Item Repair, Seagoville
- Miscellaneous Government, Seagoville
- Miscellaneous Personal Services, Seagoville
- Miscellaneous Photographers, Seagoville
- Miscellaneous Professional, Seagoville
- Mobile Home Parks & Communities , Seagoville
- Modular & Mobile Homes For Sale, Seagoville - Manufactured Homes Sale & Service
- Monuments, Tombstones, Markers & Memorials, Seagoville
- Motor Vehicle, Seagoville
- Motor Vehicle Rental & Leasing, Seagoville
- Moving Companies, Seagoville
- Moving Supplies & Equipment Rental, Seagoville
- Moving Truck Rental , Seagoville
- Music, Seagoville
- Musical Instruments & Equipment Stores, Seagoville
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