 | 400m femenino con 12 años |
| Tiempo | Nadador | Año | Localización |
| 05:07.89 | Iria G. Lemos Fernández | 2018 | ROSARIODUEÑAS |
| 05:08.91 | Irene Fernández Pardo | 2013 | MANRESA |
| 05:09.08 | Andrea D. Casabella | 2015 | CERVO |
| 05:12.76 | Andrea D. Casabella | 2015 | A Coruña |
| 05:13.00 | Andrea D. Casabella | 2015 | CERVO |
| 05:16.12 | Andrea D. Casabella | 2015 | A Coruña |
| 05:17.70 | Andrea D. Casabella | 2015 | PONTEVEDRA |
| 05:32.32 | Zaira Vila Rial | 2023 | CERVO |
| 05:32.78 | Angela Cobelo Represas | 2016 | RÍASDOSUR |
| 05:33.86 | Angela Cobelo Represas | 2016 | CERVO |
| 05:41.07 | Inés Borge Juste | 2018 | RÍASDOSUR |
| 05:43.45 | Eva Resille Santomé | 2018 | ROSARIODUEÑAS |
| 05:49.69 | María Seijo Marques | 2022 | Cervo |
| 05:50.25 | Eva Resille Santomé | 2018 | RÍASDOSUR |
| 05:50.83 | Mara B. Francisco | 2025 | CERVO |
| 05:55.13 | Flavia García Casal | 2025 | OURENSE |
| 05:55.42 | Laura Costa Fernández | 2013 | PONTEVEDRA |
| 06:15.04 | Zaira Lemos Fernández | 2014 | PONTEVEDRA |
| 06:24.55 | Lara Dominguez Díaz | 2019 | RÍAS DO SUR |
| 06:24.55 | Lara Dominguez Díaz | 2019 | RÍAS DO SUR |