- Machinery, Supplies & Equipment - Business Supplies Related, Riverside
- Mailbox Rental Services, Riverside
- Mailing, Delivery & Courier Service, Riverside
- Management Consultants & Services, Riverside
- Manicurists & Pedicurists, Riverside
- Manufacturing, Riverside
- Masonry Contractors, Riverside - Stone Mason, Brick Mason - Install & Repair
- Membership Sports & Recreation Clubs, Riverside
- Merchandising & Marketing Consultants, Riverside
- Mexican Restaurants, Riverside
- Middle Eastern Restaurants, Riverside
- Mining, Riverside
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- Miscellaneous Business Product Repair, Riverside
- Miscellaneous Government, Riverside
- Miscellaneous Manufacturing, Riverside
- Miscellaneous Personal Services, Riverside
- Miscellaneous Professional, Riverside
- Mortgage Bankers & Correspondents, Riverside
- Motor Vehicle, Riverside
- Moving & Storage Supplies & Equipment, Riverside
- Music, Riverside
- Music Schools, Riverside
- Musical Instrument Rental, Riverside - Band & Orchestra Instruments
- Musical Instruments & Equipment Stores, Riverside
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