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- MacGregor Point Provincial Park
- Mac Kenzie Trailer Camp
- MacLeod Provincial Park
- Maitland Valley Marina & Park
- Mal's Camping Inc
- Maplegrove Seasonal Park
- Maple Leaf RV Campground
- Maple Leafs Acres
- Maple Mountain Campsites
- Maple Ridge Family Campground
- Maples RV Park
- Maplewood Acres RV Park
- Mara Provincial Park
- Mariner's Paradise
- Marmora KOA
- Marten River Provincial Park
- Mazinaw Lakeside Resort
- Mc Clintock's Trailer Resort
- McGowan Lake Campground
- McLaren Campsite - St. Lawrence
- McRae Point Provincial Park
- Meadowbrook Campground
- Meaford Memorial Park
- Merrickville Lions Club Campground
- Mew Lake - Algonquin Provincial Park
- Mikisew Provincial Park
- Mille Roches Campsite - St. Lawrence
- Milton Heights Campground
- Mirror Lake Resort & Campgroundds
- Mishewah Camp
- Missinaibi Provincial Park
- Mississagi Provincial Park
- Mohawk Bay Trailer Park
- Moonlight Bay Campground
- Moonlight Bay Tent & Trailer
- Morning Mist Resort
- Mountain Lake Camp
- Mountain Trout Camp
- Mount Nemo
- Mt McKay Scenic Lookout
- Murphys Point Provincial Park
- Muskoka Glens Campsite
- Muskoka Ridge Trailer Park