| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Astley Castle | England | Warwickshire | Nuneaton | historic site | No | Ancient 4m-5m | View On Map |
| Aston Botterell – churchyard | England | Shropshire | Bridgnorth | churchyard | Yes | Lost | View On Map |
| Aston Botterell – field | England | Shropshire | Bridgnorth | field | Yes | Ancient 4m-5m | View On Map |
| Aston le Walls | England | Northamptonshire | Banbury | churchyard | Yes | Ancient 5m-7m | View On Map |
| Aston Rowant – Beacon Hill | England | Oxfordshire | Watlington | woodland | Yes | Notable | View On Map |
| Ault Hucknall | England | Derbyshire | Mansfield | churchyard | Yes | Notable | View On Map |
| Auvillars | France | Calvados - Normandie | Lisieux | churchyard | Yes | Ancient 5m-7m | View On Map |
| Avenbury | England | Herefordshire | Bromyard | churchyard | No | Notable | View On Map |
| Avening | England | Gloucestershire | Stroud | churchyard | Yes | Ancient 4m-5m, Notable | View On Map |
| Avington – Park Farm | England | Hampshire | Winchester | garden | No | Ancient 5m-7m | View On Map |
| Avondale – Rathdrum | Ireland | Co. Wicklow | Dublin | estate | Yes | Ancient 4m-5m | View On Map |
| Awliscombe | England | Devon | Honiton | churchyard | Yes | Notable | No Map Data |
| Awre | England | Gloucestershire | Gloucester | churchyard | Yes | Ancient 5m-7m | View On Map |
| Aylesford | England | Kent | Maidstone | churchyard | Yes | Notable | View On Map |
| Aylesford – The Friars | England | Kent | Maidstone | former religious site | No | Notable | View On Map |
| Aymestrey | England | Herefordshire | Leominster | churchyard | Yes | Ancient 4m-5m | View On Map |
| Aymestrey Parish | England | Herefordshire | Leominster | garden | No | Ancient 4m-5m, Ancient 5m-7m | No Map Data |
| Ayscoughfee Hall Gardens | England | Lincolnshire | Spalding | estate | Yes | Notable | View On Map |
| Bacton | England | Herefordshire | Hereford | churchyard | Yes | Ancient 5m-7m | View On Map |
| Baddesley Clinton | England | Warwickshire | Solihull | churchyard | Yes | Notable | View On Map |