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| Lease Name | Location | Operator | Oil Prod | Gas Prod |
|---|---|---|---|---|
| Ojo Caliente | Richland County, MT | Rim Operating, Inc. | ||
| Ok Corral | Richland County, MT | Jettison, Inc. | ||
| Old Border Unit | Toole County, MT | New Horizon Resources LLC | ||
| Old Railroad | Toole County, MT | A. B. Energy LLC | ||
| Olfert | Valley County, MT | A&S Mineral Development Company, LLC | ||
| Olfert "B" | Valley County, MT | A&S Mineral Development Company, LLC | ||
| Olfert "C" | Valley County, MT | A&S Mineral Development Company, LLC | ||
| Olive Volden 27-2H | Richland County, MT | MorningStar Operating LLC | ||
| Olive-Arlene 27-3-Hlid3 | Richland County, MT | MorningStar Operating LLC | ||
| Olive-Lesueur 27-4-H | Richland County, MT | MorningStar Operating LLC | ||
| Olivia 1H-18 | Richland County, MT | Wesco Operating, Inc. | ||
| Oloughlin (3) | Toole County, MT | DNR Oil & Gas Inc. | ||
| Olsen (1-20) | Sheridan County, MT | Nance Petroleum Corporation | ||
| Olser Unit | Liberty County, MT | Three Forks Resources, LLC | ||
| Olson (#2 33-17) | Hill County, MT | Solomon Exploration Inc. | ||
| Olson 0242-2 | Phillips County, MT | Scout Energy Management LLC | ||
| Olson 1-11 | Sheridan County, MT | Shakespeare Oil Co Inc | ||
| Olson 1-21-16H | Roosevelt County, MT | Green Valley Operating, LLC | ||
| Olson 11X-7 | Richland County, MT | XTO Energy Inc. | ||
| Olson 19-54-21B-2-1 | Dawson County, MT | Petro-Hunt, LLC | ||
| Olson 2-33 | Chouteau County, MT | NorthWestern Corporation | ||
| Olson 21-28THF | Roosevelt County, MT | Foundation Energy Management, LLC | ||
| Olson 31-28 | Roosevelt County, MT | White Rock Oil & Gas, LLC | ||
| Olson 32-8--27-17 | Chouteau County, MT | NorthWestern Corporation | ||
| Olson 33-13 | Chouteau County, MT | NorthWestern Corporation | ||
| Olson 43X-1 | Richland County, MT | White Rock Oil & Gas, LLC | ||
| Olson 9-32 | Chouteau County, MT | NorthWestern Corporation | ||
| Olson Bottom Federal 2658 12-10H | Richland County, MT | Oasis Petroleum North America LLC | ||
| Olson Federal (41-18) | Phillips County, MT | Scout Energy Management LLC | ||
| Olson Rasmussen (#1) | Sheridan County, MT | SM Energy Company | ||
| Olson-Jenny 1 | Toole County, MT | Keesun Corporation | ||
| Onstad | Sheridan County, MT | Northern Oil Production, Inc. | ||
| Opal 1 | Glacier County, MT | Opal Oil Corporation | ||
| Orcutt 1-31 | Pondera County, MT | Balko, Inc. | ||
| Orr | Stillwater County, MT | Midway Energy, LLC | ||
| Orr (41-21) | Liberty County, MT | MCR, LLC | ||
| Orr 1 | Stillwater County, MT | Midway Energy, LLC | ||
| Orville Hendrickson 24-12H | Sheridan County, MT | Neptune Operating LLC | ||
| Osborn 1-34H | Richland County, MT | Continental Resources Inc | ||
| Oscar 1-35H | Richland County, MT | MorningStar Operating LLC | ||
| Oscar Berger | Glacier County, MT | Montalban Oil & Gas Operations, Inc. | ||
| Oska, H (1,2) | Sheridan County, MT | Citation Oil & Gas Corp. | ||
| Ostby 1-35 | Sheridan County, MT | BAIN Resources, Inc. | ||
| Ostby 2-34 | Sheridan County, MT | BAIN Resources, Inc. | ||
| Ostby 2-35 | Sheridan County, MT | BAIN Resources, Inc. | ||
| Ostrem 2-33 | Toole County, MT | Mountain Pacific General Inc. | ||
| Oswood (8-33) | Liberty County, MT | A. B. Energy LLC | ||
| Oswood 1 | Liberty County, MT | A. B. Energy LLC | ||
| Oswood 11-14 | Liberty County, MT | A. B. Energy LLC | ||
| Oswood 14-11 | Liberty County, MT | A. B. Energy LLC |