- Machine Shop & Tool Repair Service, Riverside
- Machinery, Supplies & Equipment - Business Production Related, Riverside
- Machinery, Supplies & Equipment - Business Supplies Related, Riverside
- Magazine & Newspaper Stands, Riverside - Dealers & Distributors
- Maintenance, Cleaning & Sanitation, Riverside
- Major Appliances, Riverside - Household & Kitchen
- Management Consultants & Services, Riverside
- Manicurists & Pedicurists, Riverside
- Manufacturers Agents & Representatives, Riverside
- Manufacturers Representative, Riverside - Reps, Independent Sales Representative, Sales Agent, etc
- Manufacturing, Riverside
- Manufacturing Products, Riverside
- Marinas & Marina Services, Riverside
- Marine Contractors & Designers, Riverside
- Martial Arts & Self Defense Schools, Riverside
- Masonry Contractors, Riverside - Stone Mason, Brick Mason - Install & Repair
- Masonry Materials & Supplies, Riverside
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- Medical Alert Systems, Riverside - Medical Alarms - PERS
- Medical Diagnostic Clinics, Riverside - Clinical Labs & Centers
- Medical Equipment Manufacturers, Riverside
- Medical Supplies & Equipment, Riverside
- Membership Sports & Recreation Clubs, Riverside
- Methodist Church, Riverside
- Mexican Restaurants, Riverside
- Mildew Removal & Control, Riverside - Mold Removal
- Mini & Self Storage, Riverside
- Miscellaneous Government, Riverside
- Miscellaneous Manufacturing, Riverside
- Miscellaneous Personal Services, Riverside
- Miscellaneous Professional, Riverside
- Moravian Churches, Riverside
- Motor Vehicle, Riverside
- Moving Companies, Riverside
- Muffler Shop & Exhaust Systems, Riverside
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