Property owners County Mayo circa 1870
See article by Jean Rice explaining these records more fully.
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| Name | Address | Land |
| His Grace, the most Rev. Dr. M'Hale | St. Jarlath's Tuam | 1,284 acres. |
| John M'Gloin | Foxford | 1,078 acres. |
| Kate M'Hugh | Enniscrone, Co. Sligo | 2 acres. |
| Martin M'Nulty | Carrownedan, Swineford | 193 acres. |
| Joseph Williams Madden | Ballycastle | 4,039 acres. |
| Dr. Henry W. Mahon | Westport | 3 acres. |
| J. Ross Mahon | Strokestown | 337 acres. |
| Anne Malley | Ballina, Mayo | 5 acres. |
| George Orme Malley | Stradehill, Co. Mayo, and 26, Upper Temple-street, Dublin | 251 acres. |
| Michael Malley | Bolinglauna, Achill | 105 acres. |
| Michael Malley | Tonregn, East, Achill | 6 acres. |
| Patrick Pat. Malley | same address | 14 acres. |
| Thomas Malley | Carrabawn | 1 acre. |
| William Malley | Lecknun, Turlough, Castlebar, Co. Mayo | 36 acres. |
| Alexander Martyn | Curraghmore, Ballinrobe | 1,443 acres. |
| George Martyn | Kiltamagh | 519 acres. |
| James Massey | Rathcash, Killala | 167 acres. |
| Mayo, Earl of | Palmerston Ho., Naas | 559 acres. |
| Joseph F. Meade | Eastwood, Newtown-mountkennedy | 2,872 acres. |
| William Meade | Swineford | 259 acres. |
| James Dillon Meldon | 14, Upper Ormond-quay, Dublin | 884 acres. |
| Croasdaile C. B. Miller | Milford, Foxhall, Tuam | 1,404 acres. |
| Abraham and Joseph Mitchell | Tourmakeady, Ballinrobe | 14,179 acres. |
| Moses Monds | Sligo | 73 acres. |
| George A. Moore | Moorehall, Ballyglass | 12,371 acres. |
| Henry Moran | Carne, Belmullet | 151 acres. |
| Frederick J. Morell | England | 1,170 acres. |
| W. C. Moroney | Carne, Belmullet | 26 acres. |
| William Moroney | Fortlawn, Ballyglass, Co. Mayo | 119 acres. |
| Hon. Montague Mostyn | Rosmead, Delvin, Westmeath | 1,460 acres. |
| Arthur Mudge | Sidney House, Plympton, Devon, England | 3,634 acres. |
| James Mullanny, M.D. | Belmullet, Ballina | 22 acres. |
| J. W. Murphy | Dublin | 298 acres. |
| Patk. (Michl.) Murphy | Myle's Estate Kilmaine | 22 acres. |
| Patk. (Peter) Murphy | same address | 22 acres. |
| William Nally | Rockstown, Balla | 441 acres. |
| National Building and Land Investment Co. of Ireland (Limited), | 27 Dame-st., Dublin | 5,179 acres. |
| Rev. Michl. Naughtan | Sligo | 2,017 acres. |
| Lady Elizabeth Netterville | 29, Pembroke-road, Dublin | 72 acres. |
| Charlotte Nicholson | 11, Oxford-road, Kilburn, London | 2,477 acres. |
| Capt. John Philip Nolan | Ballinderry, Tuam | 811 acres. |
| Michael Noone, senior | Corbally, Claremorris | 2 acres. |
| Michael Noone, junior | Claremorris | 5 acres. |
| Lord Norbury, Reps. of | Valence, Edinbridge, Wederham, Kent, England | 1,024 acres. |
| Thomas O'Boyle | Newport | 1 acre. |
| Andrew O'Connor | Galway | 448 acres. |
| Arthur O'Connor | Ryehill, Tuam | 190 acres. |
| Mrs. Margaret O'Connor | Mount Druid | 6,817 acres. |
| Thomas O'Connor | Swineford | 393 acres. |
| Charles O'Donel | Binghamstown | 328 acres. |
| Dominick O'Donel | Kilcommon Lodge, Belmullet | 1,461 acres. |
| Francis O'Donel | Castlebar | 2 acres. |
| Sir George C. O'Donel | Newport House | 108 acres. |
| Hugh O'Donel | Barrackhill | 22 acres. |
| John O'Donel | Glengad | 183 acres. |
| Sir Richard A. O'Donnell | Kingstown | 7,488 acres. |
| James K. O'Dowd | Custom House, London | 255 acres. |
| Patrick O'Dowd | Westport | 1 acre. |
| Edwd. More O'Ferrall | Kildangan Castle, Monasterevan | 4,086 acres. |
| Richard J. O'Grady | Tavrane, Kilkelly | 1,236 acres. |
| James O'Hara | Lenaboy, Galway | 426 acres. |
| Cornelius O'Kelly | England, | 426 acres. |
| Owen O'Malley | Newcastle, Swineford, Co. Mayo | 1,589 acres. |
| Lord Oranmore | Castlemacgarret, Ballindine | 4,243 acres. |
| Thomas F. O'Reilly | Carne House, Belmullet | 6,472 acres. |
| Maria O'Reilly-Dease | Bray | 2,366 acres. |
| Edward Orme, R.M | Belfast | 364 acres. |
| George Orme | Rahans, Ballina | 396 acres. |
| Robert Orme | The Priory, Monkstown-road | 3,094 acres. |
| William Orme | Owenmore, Crossmolina | 11,230 acres. |
| William R. Orme | 8th Regiment, Manchester | 1,521 acres. |
| Anthony Ormsby | Ballinamore House, Kiltinagh | 4,492 acres. |
| George D. Ormsby | Esker House, Miltown, Park, Co. Westmeath | 266 acres. |
| Rev. Horatio N. Ormsby | Mallow, Co. Cork | 1,114 acres. |
| John Ormsby | Gortnerabbey, Crossmolina, and Middle Temple, London | 3,186 acres. |
| John C. Ormsby | Rinagry, Ballina | 553 acres. |
| John Yeadan Ormsby | no address given | 587 acres. |
| Thos. Ormsby, Reps. of | no address given | 252 acres. |
| Hugh O'Rourke | New-row, Dublin | 1,260 acres. |
| Capt. James Paget | Knockglass, Crossmolina | 427 acres. |
| Thomas Paget | Eastwood, Bagenalstown | 1,682 acres. |
| Col. Sir Roger William H. Palmer, bart | Cefn Park, Wrexham, Kenure Park, Dublin, Carlton Club, London SW | 80,990 acres. |
| Maj. Roger Palmer | Kingstown | 478 acres. |
| Bryan Pat Patten | Bolinglanna, Achill | 26 acres. |
| William M. Patten, Reps. of | Fitzwilliam-st., Dublin | 2 acres. |
| Fanny Perkins | Wilmount, Kells, Co. Meath | 844 acres. |
| Edmond H. Perry | Belleek Castle, Ballina | 5,108 acres. |
| William Petrie | Woodhill, Dromore West | 353 acres. |
| Bernard Peyton | Creagh's Villa, Castlebar, Co. Mayo | 1,307 acres. |
| Col. Richard Phibbs | 12, Rutland Gate, London | 1,071 acres. |
| William Pike | Glendarary, Achill | 10,697 acres. |
| Jonathan Pim | Dublin | 626 acres. |
| Rev. David Pitcairn, Reps. of | no address given | 704 acres. |
| The Hon. Mr. Plunket | Montebello, Co. Dublin | 1,777 acres. |
| Robert Polke | Killala | 17 acres. |
| Mervyn Pratt | Enniscoe, Crossmolina, Co. Mayo, and Cabra Castle, Kingscourt, Co. Cavan | 17,955 acres. |
| Margaret Prendergast | Westport | 36 acres. |
| Patrick Prendergast | 23, Lower Sackville-st., Dublin | 42 acres. |
| R. Cuffe Prendergast | Tuam | 144 acres. |
| John Proctor | Dublin | 8 acres. |
