The alphabetic listings of the monuments included in the Megalith Map.
| Name | Map Ref. | Extant? | |
| Ilderton Stone Circle | NT971205 | Yes | more... |
| Illaunimnal Stone Circle | Q600210 | No | |
| Image Wood Stone Circle | NO524990 | Yes | more... |
| Inchbaire Stone Circle | NO610960 | No | |
| Inishowen Stone Circle | M128615 | Yes | more... |
| Innesmill Stone Circle | NJ289641 | Yes | more... |
| Inschfield Stone Circle | NJ624294 | Yes | more... |
| Inverarnon Stone Circle | NN316185 | Yes | more... |
| Inveryne Stone Row | NR915749 | Yes | more... |
| Iron Hill Stone Circle | NY596147 | Yes | more... |
Stone Circles and Rows beginning with...
A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z.
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