The State's Sites and Monuments Record lists 151,308 monuments in the Republic, from fairy forts to tower houses. Here is how they fall across the 26 counties.
| County | All records | Ringforts | Fulachtaí fia | Souterrains | Standing stones | Holy wells | Crannógs | Tower houses | Mottes | Megalithic tombs | Stone circles | Ogham stones | High crosses | Round towers | Sheela-na-gigs | Rock art | Promontory forts and hillforts |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cork | 19,153 | 3,863 | 3,342 | 1,117 | 1,623 | 358 | 4 | 133 | 3 | 132 | 100 | 101 | — | 5 | 10 | 25 | 139 |
| Kerry | 13,762 | 2,322 | 561 | 873 | 520 | 183 | 1 | 44 | 3 | 68 | 32 | 160 | 5 | 3 | 3 | 385 | 98 |
| Galway | 12,511 | 2,641 | 126 | 556 | 100 | 319 | 61 | 129 | 7 | 77 | 7 | — | 12 | 9 | 3 | 2 | 22 |
| Tipperary | 9,258 | 1,480 | 191 | 35 | 366 | 106 | 10 | 161 | 42 | 33 | 6 | 3 | 16 | 4 | 23 | 2 | 7 |
| Clare | 9,019 | 2,401 | 501 | 160 | 116 | 241 | 41 | 110 | 1 | 196 | 4 | 1 | 12 | 8 | 7 | 5 | 40 |
| Mayo | 8,864 | 1,987 | 396 | 482 | 154 | 148 | 267 | 41 | 9 | 203 | 24 | 12 | 2 | 5 | 4 | 9 | 90 |
| Limerick | 8,396 | 2,203 | 198 | 29 | 191 | 159 | 13 | 86 | 14 | 14 | 14 | 4 | — | 3 | 4 | — | 8 |
| Sligo | 6,679 | 2,295 | 109 | 446 | 40 | 117 | 134 | 11 | 11 | 237 | 6 | 2 | 5 | 1 | 1 | 4 | 22 |
| Roscommon | 6,597 | 2,423 | 69 | 114 | 66 | 79 | 185 | 12 | 3 | 22 | — | 6 | 8 | 3 | 6 | — | 12 |
| Kilkenny | 5,555 | 409 | 304 | 42 | 53 | 157 | 1 | 70 | 32 | 30 | 2 | 15 | 11 | 5 | 5 | 6 | 5 |
| Meath | 4,921 | 722 | 140 | 114 | 58 | 54 | 12 | 51 | 63 | 65 | 4 | 8 | 26 | 4 | 9 | 22 | 11 |
| Offaly | 4,879 | 254 | 33 | 18 | 27 | 68 | 13 | 49 | 21 | 3 | 2 | 1 | 15 | 3 | 10 | 1 | 2 |
| Westmeath | 4,540 | 1,563 | 11 | 87 | 53 | 72 | 64 | 83 | 53 | 2 | 2 | 2 | 5 | — | 5 | 3 | 5 |
| Dublin | 4,224 | 76 | 64 | 19 | 22 | 115 | — | 57 | 15 | 37 | 4 | 1 | 4 | 5 | 4 | 6 | 12 |
| Wexford | 3,978 | 792 | 119 | 12 | 79 | 176 | — | 65 | 23 | 6 | 1 | 5 | 10 | 1 | — | 1 | 9 |
| Donegal | 3,647 | 607 | 12 | 138 | 359 | 165 | 26 | 14 | 2 | 235 | 12 | — | 11 | 2 | 1 | 157 | 85 |
| Waterford | 3,468 | 455 | 108 | 68 | 207 | 79 | 2 | 35 | 5 | 20 | 2 | 56 | 1 | 1 | 2 | 2 | 43 |
| Wicklow | 3,089 | 258 | 90 | 10 | 64 | 114 | 1 | 12 | 16 | 16 | 13 | 5 | 13 | 1 | — | 56 | 20 |
| Kildare | 3,086 | 177 | 40 | 9 | 18 | 60 | 3 | 48 | 23 | — | 3 | 8 | 15 | 5 | 4 | 5 | 4 |
| Longford | 2,659 | 828 | 18 | 15 | 27 | 27 | 22 | 11 | 15 | 9 | 2 | — | 1 | — | 2 | — | 1 |
| Cavan | 2,475 | 1,202 | 24 | 52 | 29 | 37 | 190 | 3 | 8 | 53 | 5 | 2 | — | 2 | 2 | 15 | 5 |
| Louth | 2,461 | 218 | 76 | 344 | 52 | 51 | 4 | 42 | 31 | 22 | 5 | 3 | 9 | 4 | 1 | 17 | 7 |
| Leitrim | 2,305 | 981 | 18 | 43 | 40 | 42 | 110 | 12 | — | 70 | — | 1 | 3 | — | — | — | 3 |
| Laois | 2,216 | 205 | 33 | 10 | 38 | 49 | 1 | 31 | 22 | 7 | 5 | — | 2 | 6 | 7 | 1 | 3 |
| Carlow | 1,940 | 130 | 36 | 2 | 36 | 48 | — | 11 | 8 | 6 | — | 6 | 11 | 3 | — | 29 | 2 |
| Monaghan | 1,626 | 939 | 18 | 58 | 10 | 8 | 84 | — | 3 | 53 | — | — | 2 | 2 | 1 | 38 | 1 |
Northern Ireland keeps its own record, the Northern Ireland Sites and Monuments Record, with broader type names, so its counts are shown separately.
| County | All records | Ringforts | Fulachtaí fia | Souterrains | Standing stones | Holy wells | Crannógs | Tower houses | Mottes | Megalithic tombs | Stone circles | Ogham stones | High crosses | Round towers | Sheela-na-gigs | Rock art | Promontory forts and hillforts |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Antrim | 5,447 | 625 | 10 | 455 | 248 | 37 | 31 | · | 40 | 174 | 6 | · | · | · | · | 3 | 12 |
| Down | 3,506 | 745 | 22 | 66 | 114 | 19 | 46 | · | 30 | 50 | 1 | · | · | · | · | 7 | 4 |
| Fermanagh | 2,506 | 641 | 627 | 3 | 61 | 32 | 141 | · | — | 82 | 13 | · | · | · | · | 16 | 1 |
| Tyrone | 2,257 | 480 | 23 | 14 | 205 | 25 | 43 | · | — | 134 | 28 | · | · | · | · | 9 | 5 |
| Derry / Londonderry | 2,163 | 259 | 13 | 123 | 128 | 43 | 20 | · | 3 | 120 | 19 | · | · | · | · | 4 | 2 |
| Armagh | 1,143 | 289 | 5 | 27 | 25 | 16 | 18 | · | — | 45 | 2 | · | · | · | · | — | — |
Source: Northern Ireland Sites and Monuments Record (Department for Communities, Historic Environment Division), OpenDataNI ↗, Department for Communities (open data, September 2026), with county read from each record's reference; maritime records are left out. "·" marks types the NI record has no category for (tower houses, ogham stones, high crosses, round towers, sheela-na-gigs); they can only be found in free-text descriptions, which undercounts them, so no figure is given. Megalithic tombs are not split by kind, and "possible" sites are included.
The Sites and Monuments Record lists 31,431 ringforts (raths, cashels and unclassified) in the Republic alone. Cork has the most, 3,863.
Cork, with 19,153 records, then Kerry (13,762) and Galway (12,511).
The Record lists 3,032 holy wells in the Republic; Cork has the most (358).
402 ogham stones are recorded in the Republic, most of them in Kerry (160).
National Monuments Service, Archaeological Survey of Ireland, Sites and Monuments Record ↗ (open data), counted by the county and monument class each record gives. A record is a recorded site, not always a visible one: some survive only as a cropmark or a note in an old survey. The type columns leave out records of objects since moved elsewhere ("present location"), so those are not counted twice; the all-records total includes every record. Every record can be looked up on the Historic Environment Viewer ↗.