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Historical Markers in Ismay
Miles City is the county seat for Custer County
Ismay is in Custer County
ADJACENT TO CUSTER COUNTY Powder River County (7) ►
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| On Jail House Lane near North 1, on the right when traveling south. |
| On U.S. 12 near Powder River Road, on the left when traveling east. Reported permanently removed. |
| On Whitney Creek Road at Ismay Road, on the right when traveling east on Whitney Creek Road. |
Nov. 11, 2026