The Boulder Mountains are a mountain range running north–south west of Boulder between Helena and Butte in the U.S. state of Montana, parts of the range are in four different counties, including Deer Lodge County is a county in the U.S. state of Montana, and was founded in what year?
Boulder Mountains (Montana):  Parts of the range are in four different counties: Deer Lodge, Jefferson, Lewis and Clark, and Silver Bow.
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