So I decided to try to map out the approximate locations of the dots on this map. My method was to hold the cursor over Google maps where it looked like the pin would be, and zoom in until I identified something. The map in the show was (obviously) not 100% accurate so this is just a best guess scenario.
From East to West:
Florida: Disney World. Alabama: the Taladega Forest or possibly Lake Martin Pennsylvania: in Johnstown/Somerset area New York: Between several towns (Cohocton, Wheeler, and Prattsburg) Indiana: Fort Wayne [edit: lunamay3.tumblr.com says The Beast of Busco in nearby Churubusco is more likely], or Churubusco Illinois: the city of Normal, (but I bet they were going for Springfield) Wisconsin: Lake Wisconsin, and somewhere near Wausau or Merrill Minnesota: Brainerd [edit: cordria.tumblr.com makes a good case for the location being Milford Mine, which had a flood in 1924 that killed almost everyone in the mine, and is considered haunted], Milford Mine Nebraska: Clearwater Wyoming: Hole-in-the-Wall Lake Montana: Fort Peck, Geraldine, Helena, Great Falls Utah: Salt Lake City, Argyle Ridge Arizona: Between Dilkon and Indian Wells Nevada: Elko, Rochester, Chukar Ridge California: Lake Almanor, Rancho Tehama Reserve, Tulelake Idaho: Atomic City, Gold Creek, Cottonwood, Burgdorf, Fruitvale, a big empty spot between Weiser and Garden Valley, Stanley, Mountain Home Air Force Base Washington: Lacrosse, Keller, Tonasket, Indian Dan State Wildlife Recreation Area, Wenatchee, Hatton, Mesa, Hanford [an ex-nuclear site!], Walla Walla, way too many sites near the Oregon border, Yakima, Morton, an area between Carson and Trout lake, Badger Gulch, Mt. Buckindy