American Junior Records are those ratified by USATF. Junior Records are restricted to athletes who do not turn 20 at any time during the calendar year in which the mark is made.
Symbols: + = event not officially recognized by USATF; (A) = altitude-aided mark–over 1000m of altitude (in affected events only); i = made indoors; p = mark still pending ratification
| Running Events | ||||
| 100 | 10.98 | Candace Hill (Georgia HS) | Shoreline, Washington | 6/20/15 |
| 200 | 22.11(A) | Allyson Felix (California HS) | Mexico City, Mexico | 5/03/03 |
| (low-altitude)+ | 22.43 | Candace Hill (Georgia HS) | Cali, Colombia | 7/19/15 |
| 400 | 49.89 | Sanya Richards-Ross (Texas) | Sacramento, California | 7/17/04 |
| 800 | 1:58.21 | Ajee’ Wilson (adidas) | Moscow, Russia | 8/18/13 |
| 1500 | 4:03.39 | Alexa Efraimson (Nike) | Eugene, Oregon | 5/30/15 |
| Mile | 4:35.24 | Polly Plumer (California HS) | Westwood, California | 5/16/82 |
| 4:24.11ip | Mary Cain (Nike OP) | Allston, Massachusetts | 1/24/14 | |
| 2000St | 6:29.20 | Maddie Meyers (Washington HS) | Villeneuve-d’Ascq, France | 7/10/11 |
| Steeple | 9:46.48 | Madie Boreman (Colorado) | Eugene, Oregon | 6/10/17 |
| 3000 | 8:57.27 | Ceci St. Geme (Stanford) | Durham, North Carolina | 7/27/82 |
| 5000 | 15:43.31 | Laurynne Chetelat (Stanford) | Stanford, California | 3/27/09 |
| 10,000 | 32:51.20 | Lindsay Scherf (Harvard) | New York, New York | 5/07/05 |
| 100 Hurdles | 12.74 | Dior Hall (USC) | Eugene, Oregon | 6/13/15 |
| 400 Hurdles | 53.82 | Sydney McLaughlin (New Jersey HS) | Sacramento, California | 6/25/17 |
| 53.60p | Sydney McLaughlin (Kentucky) | Fayetteville, Arkansas | 4/27/18 | |
| 52.75p | Sydney McLaughlin (Kentucky) | Knoxville, Tennessee | 5/13/18 | |
| Relay Events | ||||
| 4 x 100 | 43.29 | National Team | Eugene, Oregon | 8/08/06 |
| (Bianca Knight, Jeneba Tarmoh, Elizabeth Olear, Gabby Mayo) | ||||
| 4 x 400 | 3:27.60 | National Team | Grosseto, Italy | 7/18/04 |
| (Alex Anderson 53.1, Ashlee Kidd 51.6, Stephanie Smith 51.0, Natasha Hastings 51.9) | ||||
| Field Events | ||||
| High Jump | 1.99 | 6-6¼ | Vashti Cunningham (Nike) | Sacramento, California | 6/23/17 |
| Pole Vault | 4.45 | 14-7¼ | Desiree Freier (Texas HS) | Eugene, Oregon | 7/24/14 |
| 4.46 | 14-7½p | Lexi Weeks (Arkansas HS) | Black Springs, Arkansas | 7/04/15 | |
| Long Jump | 6.83 | 22-5 | Kate Hall (Maine HS) | Greensboro, North Carolina | 6/21/15 |
| Triple Jump | 14.15 | 46-5¼ | Keturah Orji (Georgia) | Eugene, Oregon | 6/13/15 |
| Shot | 18.35 | 60-2½ | Raven Saunders (Southern Illinois) | Eugene, Oregon | 6/11/15 |
| Discus | 60.59 | 198-9 | Shelbi Vaughan (Texas HS) | Bloomington, Indiana | 6/15/12 |
| [Seilala Sua (UCLA) has 6 unratified marks superior to Vaughan, topped by 63.44 | 208-2 Salinas, California, 5/21/97] | ||||
| Hammer | 68.12 | 223-6 | Shelby Ashe (Throw 1 Deep) | Bloomington, Indiana | 6/16/12 |
| Javelin | 53.85 | 176-8 | Avione Allgood (Nevada HS) | Eugene, Oregon | 6/25/11 |
| 55.22 | 181-2p | Haley Crouser (Oregon HS) | Beaverton, Oregon | 4/13/12 | |
| 56.59 | 185-8p | Madison Wiltrout (Pennsylvania HS) | North Huntington, Pennsylvania | 5/07/15 | |
| Multi Event | ||||
| Heptathlon | 6018 | Kendell Williams (Georgia) | Athens, Georgia | 4/11/14 |
| (13.32, 1.83/6-0, 12.59/41-3¾, 24.58 [3719], 5.93/19-5½, 38.15/125-2, 2:18.86 [2299]) | ||||
| Road Event | ||||
| Marathon+ | 2:34:24 | Cathy O’Brien (New Hampshire HS) | Olympia, Washington | 5/12/84 |
| Walking Events | ||||
| 3000Walk | 13:31.79p | Taylor Ewert (Ohio HS) | Philadelphia, Pennsylvania | 4/28/18 |
| 5000Walk | 22:38.16p | Taylor Ewert (Ohio HS) | Philadelphia, Pennsylvania | 4/28/18 |
| 5K Walk(r) | 23:08p | Taylor Ewert (Ohio HS) | Toronto, Ontario | 8/10/18 |
| 10,000 Walk | 49:31.88 | Anali Cisneros (Illinois HS) | Bydgoszcz, Poland | 7/19/16 |
| 49:07.52p | Taylor Ewert (Ohio HS) | Bloomington, Indiana | 6/17/18 | |
| 45:57.81p | Taylor Ewert (Ohio HS) | Tampere, Finland | 7/14/18 | |
as of August 20, 2018