- Machine Shop & Tool Repair Service, Preston
- Machinery, Supplies & Equipment - Business Production Related, Preston
- Machinery, Supplies & Equipment - Business Supplies Related, Preston
- Magazine Ads, Preston - Periodical Advertising
- Maintenance, Cleaning & Sanitation, Preston
- Management Consultants & Services, Preston
- Manufacturing, Preston
- Manufacturing Products, Preston
- Marine Contractors & Designers, Preston
- Meat Market, Wholesale & Products, Preston
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- Methodist Church, Preston
- Mildew Removal & Control, Preston - Mold Removal
- Ministries Church, Preston
- Miscellaneous Government, Preston
- Miscellaneous Personal Services, Preston
- Miscellaneous Professional, Preston
- Modular & Mobile Homes For Sale, Preston - Manufactured Homes Sale & Service
- Motion Picture Pre & Post Production Services, Preston
- Motor Vehicle, Preston
- Museums, Preston
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