| Climber Name | # Ascents Recorded | Notes |
|---|---|---|
| Jean-Michel Gosselin | 1 | |
| Jean-Paul Finne | 1 | |
| Jeff Beaulieu | 1 | |
| Jeff Lowe | 1 | |
| Jemima Churchhouse | 1 | |
| Jenn DeBellis | 1 | |
| Jenny Lavarda | 1 | |
| Jenya Kazbekova | 1 | |
| Jeremy Fullerton | 1 | |
| Jeremy Smith | 1 | |
| Jérôme Jean-Charles | 1 | |
| Jessica Mccaskey | 1 | |
| Jessie Wence | 1 | Very strong female boulderer from the South East of the US. Climbs mainly in NC and on the moonboard. Currently has climbed up to 8A boulders. |
| J. F. Hamilton | 1 | |
| Jim Burton | 1 | |
| Jim Campbell | 1 | |
| Jim Merli | 1 | |
| Jim Petersen | 1 | |
| Jim Sandford | 1 | References[1] Free Will: The Climbing Life of Jim Sandford by David Smart, Gripped 2021 https://gripped.com/profiles/free-will-the-climbing-life-of-jim-sandford/ |
| Jindrich Sustr | 1 |