| (1) | 55.41 | CBP | Twinelle Hopeson | (Croydon Harriers) | 1 FINAL | Kingsmeadow Stadium | 9 May 2010 |
| (2) | 55.62 | | Arabella Wilson | (Winchester & District AC) | 1 FINAL | Kingsmeadow Stadium | 12 May 2024 |
| (3) | 55.70 | | Katie Snowden (U17) | (Herne Hill Harriers) | 2 FINAL | Kingsmeadow Stadium | 9 May 2010 |
| (4) | 56.0 | | Adelle Tracey | (Guildford & Godalming AC) | 1 FINAL | Kingsmeadow Stadium | 13 May 2012 |
| (5) | 56.06 | | Yimika Adewakun | (Blackheath & Bromley Harriers AC) | 1 FINAL | Kingsmeadow Stadium | 15 May 2011 |
| (6) | 56.3 | CBP | Claire Nichols | (Woking AC) | 1 FINAL | Wimbledon Park | 10 May 1997 |
| | 56.3 | | Jessie Knight | (Herne Hill Harriers) | 2 FINAL | Kingsmeadow Stadium | 13 May 2012 |
| (8) | 56.35 | | Victoria Hewett | (Woking AC) | 1 FINAL | Kingsmeadow Stadium | 10 May 2009 |
| (9) | 56.36 | | Nicole Kendall | (Kingston AC & Polytechnic Harriers) | 1 FINAL | Kingsmeadow Stadium | 24 May 2015 |
| (10) | 56.41 | | Sophie Osborn | (Kingston AC & Polytechnic Harriers) | 2 FINAL | Kingsmeadow Stadium | 12 May 2024 |
| |
| 10 performances of 56.41 or better. |
