- Machine Shop, Kelseyville
- Machinery, Supplies & Equipment - Business Production Related, Kelseyville
- Machinery, Supplies & Equipment - Construction & Contractor Related, Kelseyville
- Mail Delivery Service, Kelseyville
- Major Appliances, Kelseyville - Household & Kitchen
- Management Consultants & Services, Kelseyville
- Manufacturing, Kelseyville
- Marinas & Marina Services, Kelseyville
- Marine Supplies & Equipment, Kelseyville - Boat Supplies
- Maytag Appliances, Kelseyville
- Medical Claims Processing & Assistance, Kelseyville
- Medical Equipment, Supplies, Devices & Instruments - Repair & Service, Kelseyville
- Membership Sports & Recreation Clubs, Kelseyville
- Methodist Church, Kelseyville
- Mexican Restaurants, Kelseyville
- Mini & Self Storage, Kelseyville
- Miscellaneous Business Product Repair, Kelseyville
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- Miscellaneous Household Item Repair, Kelseyville
- Miscellaneous Government, Kelseyville
- Miscellaneous Manufacturing, Kelseyville
- Miscellaneous Personal Services, Kelseyville
- Mobile Home Parks & Communities , Kelseyville
- Mortgage Companies, Kelseyville
- Motor Vehicle, Kelseyville
- Motor Vehicle Rental & Leasing, Kelseyville
- Moving & Storage Supplies & Equipment, Kelseyville
- Moving Companies, Kelseyville
- Moving Services - Labor & Material, Kelseyville
- Moving Truck Rental , Kelseyville
- Muffler Shop & Exhaust Systems, Kelseyville
- Music, Kelseyville
- Music Lessons, Kelseyville
- Music Lessons - Instrumental, Kelseyville
- Musical Instruments Repair, Sales & Service, Kelseyville
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