Yellowstone County is the most populous county in the U.S. state of Montana. As of the 2020 census, the population was 164,731. Its county seat is Billings, the state's most populous city. Like the nearby national park, Yellowstone County is named after the Yellowstone River which roughly bisects the county, flowing southwest to northeast. The river, in turn, was named for the yellow sandstone cliffs in what is now Yellowstone County.
Yellowstone County is included in the Billings, Montana Metropolitan Statistical Area.
Geography
According to the United States Census Bureau, the county has a total area of , of which is land and (0.6%) is water.
Major highways
Transit
- Billings Metropolitan Transit
- Express Arrow
- Jefferson Lines
Adjacent counties
- Musselshell County – north
- Rosebud County – northeast
- Treasure County – east
- Big Horn County – southeast
- Carbon County – southwest
- Stillwater County – west
- Golden Valley County – northwest
National protected areas
- Nez Perce National Historical Park (part)
- Pompeys Pillar National Monument
Demographics
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Communities
Cities
- Billings (county seat)
- Laurel
Town
- Broadview
Census-designated places
- Acton
- Ballantine
- Custer
- Huntley
- Lockwood
- Mountain View Colony
- Nibbe
- Pompeys Pillar
- Shepherd
- Worden
Other unincorporated communities
- Anita
- Billings Heights
- Bull Mountain
- Comanche
- Hesper
- Homewood Park
- Indian Arrow
- Newton
- Osborn
- Yegen
Ghost towns
- Coulson
- Mossmain
- Rimrock
- Waco
Education
School districts include:
K-12 (unified):
- Custer K-12 Schools
- Huntley Project K-12 Schools
- Lockwood K-12 Schools
High school districts: