Park County.
No, it is named after the Yellowstone River, a tributary of the Missouri.
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Yes, Wyoming exists. Wyoming is a US state, located in the western United States. Wyoming is bordered by Montana, South Dakota, Nebraska, Colorado, Utah, and Idaho. Yellowstone National Park is located in the northwestern corner of Wyoming. There are other places named Wyoming, such as the Wyoming Valley in Pennsylvania.
Yellowstone national park
Yellowstone
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the yellow rock on the mts
Yes. The geyser named Old Faithful is located in northwestern Wyoming in Yellowstone National Park.
Yellowstone National Park
While it's certainly not impossible that somewhere in Utah there is a geyser named "old faithful", it's not the famous one, because that one is actually in Yellowstone National Park. (The geyser is in Wyoming, but it's not terribly far from either Idaho or Montana ... about 10 miles to either one. It's about 200 miles outside of Utah, though.)
Yellowstone National Park.
Wyoming has a geyser in the Shoshone Geyser Basin, Teton County, that is named "Little Bulger Geyser" or "Bulger Geyser". There is no information to be found about any other locations in Montana or Wyoming that are named Bulger.