| 101 | RIDGE HILL-TEJON | Kern County, CA | Oil Property | Jan 2023 |
| 102 | RIEDMAN | Los Angeles County, CA | Oil & Gas Property | Nov 1999 |
| 103 | RIGHETTI | Santa Barbara County, CA | Oil & Gas Property | Jun 2019 |
| 104 | RILCO 1 | Sacramento County, CA | Gas Property | Sep 1998 |
| 105 | RING | Kern County, CA | Oil & Gas Property | Oct 2023 |
| 106 | RING 14 | Kern County, CA | Oil Property | Apr 2025 |
| 107 | RING VEDDER | Kern County, CA | Oil Property | May 2025 |
| 108 | RIO VIEJO | Kern County, CA | Oil & Gas Property | Apr 2025 |
| 109 | RIO VISTA S | Solano County, CA | Oil & Gas Property | Mar 2025 |
| 110 | RIPLEY | Kern County, CA | Oil & Gas Property | Jul 2016 |
| 111 | RIPPERDAN | Fresno County, CA | Oil & Gas Property | Apr 2025 |
| 112 | RITTER C | San Luis Obispo County, CA | Oil Property | Aug 2015 |
| 113 | RIVER GARDEN FARMS | Yolo County, CA | Gas Property | Feb 2001 |
| 114 | RIVER GARDEN FARMS | Yolo County, CA | Gas Property | Nov 1997 |
| 115 | RIVER ISLANDS LAND CO | Sacramento County, CA | Gas Property | Feb 1990 |
| 116 | ROARING RIVER 20 | Solano County, CA | Oil & Gas Property | Dec 2020 |
| 117 | ROBERTS | Kern County, CA | Oil & Gas Property | Dec 2020 |
| 118 | ROBERTS FEE | Kern County, CA | Oil & Gas Property | Dec 1987 |
| 119 | ROBERTSON | Ventura County, CA | Oil & Gas Property | Apr 2025 |
| 120 | ROBERTSON | Kern County, CA | Oil & Gas Property | Jul 2024 |
| 121 | ROBINSON | Los Angeles County, CA | Oil & Gas Property | Feb 2020 |
| 122 | ROBINSON | Kern County, CA | Oil Property | Apr 2025 |
| 123 | ROC-KCL G | Kern County, CA | Oil & Gas Property | Apr 2025 |
| 124 | ROCK | San Luis Obispo County, CA | Oil & Gas Property | May 2025 |
| 125 | ROCO | Kern County, CA | Oil & Gas Property | Apr 2025 |
| 126 | RODGERS | Kern County, CA | Oil Property | Dec 2018 |
| 127 | RODGERS-JONES | Kern County, CA | Oil Property | Oct 1985 |
| 128 | RODUNER | Madera County, CA | Gas Property | Jun 2005 |
| 129 | ROE 1 | Kern County, CA | Oil & Gas Property | Apr 2025 |
| 130 | ROE 3 | Kern County, CA | Oil & Gas Property | Apr 2025 |
| 131 | ROOSA | Los Angeles County, CA | Oil & Gas Property | May 2025 |
| 132 | ROSECRANS | Los Angeles County, CA | Oil & Gas Property | Apr 2025 |
| 133 | ROSEDALE OIL UNIT NO | Kern County, CA | Oil & Gas Property | May 2025 |
| 134 | ROSEDALE RANCH | Kern County, CA | Oil & Gas Property | May 2025 |
| 135 | ROSEDALE-STEVENS COMMUNITY | Kern County, CA | Oil & Gas Property | Feb 2025 |
| 136 | ROSEMOND 1 | Los Angeles County, CA | Oil & Gas Property | May 2025 |
| 137 | ROSENBERG | Monterey County, CA | Oil & Gas Property | May 2025 |
| 138 | ROSINA | Kern County, CA | Oil Property | Dec 2020 |
| 139 | ROSS | Kern County, CA | Oil & Gas Property | Mar 1991 |
| 140 | ROSSI | Ventura County, CA | Oil & Gas Property | Apr 2025 |
| 141 | ROTH 1 | Yolo County, CA | Gas Property | May 2010 |
| 142 | ROWDETT | Kern County, CA | Oil Property | Jan 2020 |
| 143 | ROWLAND | Los Angeles County, CA | Oil & Gas Property | May 2003 |
| 144 | RUBEL | Los Angeles County, CA | Oil & Gas Property | May 2025 |
| 145 | RUBY SMITHWICK | Kern County, CA | Oil & Gas Property | May 2025 |
| 146 | RUDNICK | Kern County, CA | Oil & Gas Property | Apr 2025 |
| 147 | RUDOLPH | San Benito County, CA | Oil Property | Jun 2025 |
| 148 | RUSSELL | Yolo County, CA | Gas Property | Dec 1986 |
| 149 | RUSSELL | Santa Barbara County, CA | Oil & Gas Property | May 2025 |
| 150 | RUSSELL | Yolo County, CA | Gas Property | Mar 2004 |
| 151 | RVGU | Contra Costa County, CA | Oil & Gas Property | Apr 2025 |
| 152 | RX UNIT 2 | Sutter County, CA | Gas Property | Apr 2025 |
| 153 | RYAN BROWN | Kern County, CA | Oil Property | May 2025 |
| 154 | RYER | Solano County, CA | Oil & Gas Property | Feb 2024 |
| 155 | RYNNE-FISHER | Los Angeles County, CA | Oil & Gas Property | May 2013 |