Federation · USA
United States national best marks
Best mark per athlete by United States athletes in each event, compiled from the all-time lists we import. Derived national bests — not official national records (see note below).
100
Stored athletes
39
Distinct marks shown
Women's 400m
Derived 14 Sep 2026
| # | Athlete | Mark | Date | Venue | Age |
|---|---|---|---|---|---|
| 1 | Sydney McLaughlin-Levrone | 47.78 | 18 Sep 2025 | — | 26 |
| 2 | Sanya Richards-Ross | 48.70 | 16 Sep 2006 | — | 21 |
| 3 | Valerie Brisco-Hooks | 48.83 | 6 Aug 1984 | — | 24 |
| 3= | Valerie Brisco | 48.83 | 6 Aug 1984 | — | — |
| 5 | Aaliyah Butler | 48.84 | 10 Jul 2026 | — | 22 |
| 5= | Aailyah Butler | 48.84 | 10 Jul 2026 | — | — |
| 7 | Madison Whyte | 48.97 | 13 Jun 2026 | — | 21 |
| 8 | Chandra Cheeseborough | 49.05 | 6 Aug 1984 | — | 25 |
| 9 | Britton Wilson | 49.13 | 13 May 2023 | — | 22 |
| 9= | Kaylyn Brown | 49.13 | 8 Jun 2024 | — | 19 |
| 11 | Gabby Thomas | 49.14 | 5 Apr 2025 | — | 28 |
| 12 | Allyson Felix | 49.26 | 27 Aug 2015 | — | 29 |
| 13 | Jearl Miles-Clark | 49.40 | 14 Jun 1997 | — | — |
| 14 | Kendall Ellis | 49.46 | 23 Jun 2024 | — | — |
| 15 | Francena McCorory | 49.48 | 28 Jun 2014 | — | — |
| 16 | Shakima Wimbley | 49.52 | 23 Jun 2018 | — | — |
| 17 | Monique Hennagan | 49.56 | 17 Jul 2004 | — | — |
| 18 | Athing Mu-Nikolayev | 49.57 | 12 Jun 2021 | — | — |
| 19 | Isabella Whittaker | 49.58 | 12 Jun 2025 | — | — |
| 20 | Marion Jones | 49.59 | 16 Apr 2000 | — | 24 |
| 21 | Wadeline Venlogh | 49.60 | 3 Oct 2019 | — | — |
| 22 | Phyllis Francis | 49.61 | 3 Oct 2019 | — | — |
| 23 | Gwen Torrence | 49.64 | 15 Jul 1992 | — | 27 |
| 23= | Dee Dee Trotter | 49.64 | 23 Jun 2007 | — | — |
| 23= | Debbie Dunn | 49.64 | 26 Jun 2010 | — | — |
| 23= | Sanaria Butler | 49.64 | 18 Apr 2026 | — | — |
| 27 | Lillie Leatherwood | 49.66 | 15 Jun 1991 | — | — |
| 28 | Shamier Little | 49.68 | 21 Jul 2023 | — | 28 |
| 29 | Courtney Okolo | 49.71 | 23 Apr 2016 | — | — |
| 30 | Quanera Hayes | 49.72 | 24 Jun 2017 | — | — |
| 30= | Rosaline Effiong | 49.72 | 8 Jun 2024 | — | — |
| 32 | Alexis Holmes | 49.77 | 9 Aug 2024 | — | — |
| 33 | Lynna Irby-Jackson | 49.80 | 9 Jun 2018 | — | — |
| 34 | Talitha Diggs | 49.83 | 8 Jul 2023 | — | — |
| 35 | Diane Dixon | 49.84 | 25 Sep 1988 | — | — |
| 35= | Natasha Hastings | 49.84 | 23 Jun 2007 | — | — |
| 37 | Denean Hill | 49.87 | 25 Sep 1988 | — | — |
| 37= | LaTasha Colander | 49.87 | 16 Jul 2000 | — | — |
| 39 | Monique Henderson | 49.96 | 25 Jun 2005 | — | — |
| 40 | Pam Marshall | 49.99 | 17 May 1986 | — | — |
| 41 | Maicel Malone | 50.05 | 6 Jul 1994 | — | — |
| 42 | Rochelle Stevens | 50.06 | 22 Jun 1992 | — | — |
| 43 | Jessica Beard | 50.08 | 23 Jun 2018 | — | — |
| 43= | Rachel Joseph | 50.08 | 16 May 2026 | — | — |
| 45 | Michelle Collins | 50.11 | 13 May 2000 | — | — |
| 46 | Natasha Kaiser-Brown | 50.17 | 17 Aug 1993 | — | — |
| 47 | Mary Wineberg | 50.24 | 23 Jun 2007 | — | — |
| 48 | Taylor Ellis-Watson | 50.25 | 3 Jul 2016 | — | — |
| 48= | JaMeesia Ford | 50.25 | 15 May 2026 | — | — |
| 50 | Ashley Spencer | 50.28 | 7 Jun 2013 | — | — |
One mark per athlete — the athlete's best while representing United States. Equal marks share a rank ("1=" style). Showing the top 50 of 100 stored. An athlete with marks for two nations appears under each nation represented at the time (e.g. Obikwelu under Nigeria and Portugal).
About this derivation
These lists are derived from the marks in our database — including the complete legal all-time lists imported from alltime-athletics.com — grouped by the nation the athlete was representing at each mark. They are not official national records: federations ratify national records under their own eligibility rules, and some marks here may not qualify.