American Masters 12 hr. Outdoor Track & Field Records
| pending | |
| women-only |
Men
| Division | Performance | Name | Location | Date |
| 40-44 | 154,000 m | Bernd Heinrich (44) | Ottawa, CAN | 1984-May-19 |
| 45-49 | 130,871 m | Roy Pirrung (47) | Eldridge, IA | 1996-May-20 |
| 50-54 | 140,400 m | Jay Aldous (50) | Phoenix, AZ | 2011-Dec-18 |
| 55-59 | 131,129 m | Gard Leighton (57) | Hayward, CA | 1991-Aug-03 |
| 60-64 | 111,200 m | David Lygre (60) | Queen Creek, AZ | 2002-Dec-31 |
| 65-69 | 120,400 m | Ray Piva (65) | Hayward, CA | 1991-Aug-03 |
| 70-74 | 86,296 m | Ed Rousseau (70) | Eldridge, IA | 2010-May-01 |
| 75-79 | 94,400 m | Ray Piva (77) | San Diego, CA | 2003-Nov-08 |
| 80-84 | 67,864 m | Edson Sower (80) | Phoenix, AZ | 1995-Dec-27 |
Women
| Division | Performance | Name | Location | Date |
| 40-44 | 124,650 m | Lynn O'Malley (41) | Portland, OR | 1991-Sep-28 |
| 45-49 | 124,300 m | Suzanna Bon (47) | Phoenix, AZ | 2011-Dec-18 |
| 50-54 | 122,031 m | Sandra Kiddy (54) | Hayward, CA | 1991-Aug-03 |
| 55-59 | 114,000 m | Sue Ellen Trapp (56) | Dallas, TX | 2002-Nov-29 |
| 60-64 | 95,604 m | Betty Frankum (62) | San Diego, CA | 2001-Nov-10 |
| 65-69 | 97,365 m | Helen Klein (68) | Santa Rosa, CA | 1991-Mar-24 |
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