Pastoral area 21, named after the locally born St Edmund Arrowsmith, is a subdivision of the Catholic Archdiocese of Liverpool, incorporating the thirteen parishes listed here:
| St Oswald | Ashton |
| Our Lady Immaculate | Bryn |
| St Lewis | Croft |
| All Saints | Golborne |
| English Martyrs | Haydock |
| St Benedict | Hindley |
| Sacred Heart | Hindley Green |
| St Catherine | Lowton |
| Ss Mary & John | Newton |
| St David | Newton |
| St Patrick | Newton |
| Holy Family | Platt Bridge |
| St Wilfrid | Stubshaw Cross |