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Petroleum County, MT
| Petroleum County Population: 493 Population Density: 0.3 per square mile Water Area Percentage: 1.2% (20.11 square miles) Land Area Percentage: 98.8% (1,653.90 square miles) Total Area: 1,674.01 square miles Housing Units: 292 per square mile County Links | 
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| Quick Links Upper State Lake News Upper State Lake Photos Upper State Lake Videos | 





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