| Site name | Country | County | Nearest town | Site type | Access | Classification (girth in metres) | View on map |
|---|---|---|---|---|---|---|---|
| Ivington – Chipps House | England | Herefordshire | Leominster | garden | Yes | Notable | View On Map |
| Iwade | England | Kent | Sittingbourne | churchyard | Yes | V - con | View On Map |
| Iwerne Minster | England | Dorset | Blandford Forum | churchyard | Yes | Ancient 7m+ | View On Map |
| Jay’s Copse – Haslemere | England | Surrey | Haslemere | woodland | No | Ancient 4m-5m | View On Map |
| John of Gaunt’s Deer Park | England | Hampshire | Romsey | historic site | No | Ancient 4m-5m | View On Map |
| Jumièges Abbey | France | Seine-Maritime - Normandie | Rouen | former religious site | Yes | Notable | View On Map |
| Keffolds Farm | England | Surrey | Haslemere | garden | No | Ancient 7m+ | View On Map |
| Keinton Mandeville | England | Somerset | Glastonbury | churchyard | Yes | Ancient 4m-5m | View On Map |
| Kelburn Castle | Scotland | Ayrshire | Largs | historic site | Yes | Ancient 5m-7m | View On Map |
| Kemback House – Dura Den | Scotland | Fife | Cupar | garden | No | Notable | View On Map |
| Kemble | England | Gloucestershire | Cirencester | churchyard | Yes | Ancient 4m-5m | View On Map |
| Kemeys Commander | Wales | Monmouthshire | Usk | churchyard | Yes | Lost | View On Map |
| Kemsing | England | Kent | Sevenoaks | churchyard | Yes | Lost | View On Map |
| Kemsing – footpath | England | Kent | Sevenoaks | footpath/road | Yes | Ancient 5m-7m | View On Map |
| Kenardington | England | Kent | Ashford | churchyard | Yes | Lost | View On Map |
| Kenderchurch – nr Pontrilas | England | Herefordshire | Abergavenny | churchyard | Yes | Notable | View On Map |
| Kenley | England | Shropshire | Shrewsbury | churchyard | Yes | Ancient 4m-5m, Ancient 5m-7m, Ancient 7m+ | View On Map |
| Kenn | England | Devon | Exeter | churchyard | Yes | Ancient 7m+ | View On Map |
| Kennel Copse | England | Hampshire | Southampton | woodland | No | Ancient 4m-5m, Lost | View On Map |
| Kennington | England | Kent | Ashford | churchyard | Yes | Ancient 5m-7m, Ancient 7m+ | View On Map |