| Name: | Portmarnock | CISP No: | POMCK |
| Place: | Portmarnock | Grid Ref: | O 2440 4510 (IR)
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| Parish: | Coolock | Stones: | 1 |
| County: | Dublin (Baile Átha Cliath) , Ireland | Saint(s): | none |
| Site Type: | Incomplete Information |
Macalister/1945, 21, gives the location of the stone in 1868 according to Shearman and Ferguson: `formerly standing beside St. Marnock's well, near Malahide, Co. Dublin'.