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Place
- Mackinac5
- Mackinac Island3
- Madison3
- Maine2
- Maligne Canyon, ca. 6 mi NE of Jasper1
- Manchester1
- Manitoba1
- Marble Canyon, Tokumm Creek, Kootenay National Park1
- Marlow, Near Sand Pond1
- Marquette1
- Maryland1
- Massachusetts1
- Medina Twp1
- Mexico2
- Michigan44
- Midland1
- Mile 39.5 Mt. Baker Rd., SE corner Sect 36, Nooksack River1
- Milford, Lakeside Laboratory1
- Minnehaha1
- Minnesota5