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Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2010 United States Census, the population was 147,972, and a 2019 estimate put the population at 161,300. Its county seat is Billings. Yellowstone County is named for the Yellowstone River which roughly bisects the county, flowing southwest to northeast. The river in turn was named after the yellow Sandstone cliffs in what is now Yellowstone County.
Stahly Engineering is available to help you plan and execute your next project involving engineering, survey, or grant services.
Helena, MT Office
3530 Centennial Drive
Helena, MT 59601
Billings, MT Office
2223 Montana Ave, Suite 201
Billings, MT 59101
Bozeman, MT Office
851 Bridger Drive, Suite 1
Bozeman, MT 59715
Great Falls, MT Office
219 2nd Ave S, Suite 302
Great Falls, MT 59405
Cody, WY Office
1001 12th Street
Cody, WY 82414
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