Some key facts and figures relating to Monmouth School.
| Pupil Numbers | |||
| The Grange | 7-11 years | 110 boys | Day pupils but some boarding in final year |
| Senior School | 11-18 years | 589 boys | 70% day pupils 30% boarders |
| Sixth Form | 16-18 years | 183 boys | (Co-ordinated Sixth Form with HMSG) |
| Boarding Houses | |||
| Junior boarding | St James House | 10-13 years | Forms P4, I & II |
| Senior boarding | School, New, Weirhead & Chapel Houses | 13-18 years | Forms III - VI2 |
| Day Houses | |||
| Lower School | Wye & Dean Houses | 11-13 years | Forms I & II |
| Middle School | Monmouth, Town, Hereford & Severn House | 13-16 years | Forms III, IV & V |
| Sixth Form | Tudor House & Glendower House | 16-18 years | Forms VI1 & VI2 |