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County Down natives listed on the 1851 Census Returns for Wales.
| | Name | Parent or spouse names | Birth Year | Place of Birth | Relation | Residence | | Thomas Askins | | abt 1822 | Ballymagarret, Down, Ireland | Private | Brecon St John The Evangelist, Breconshire | | Peter Bice | | abt 1814 | Down, Ireland | Visitor | Tyddyn Prydd, Montgomeryshire | | Mary Jane Branks | Mary | abt 1840 | Apperley Dene, Down, Ireland | Daughter | Swansea St Mary, Glamorgan | | Berney Burns | Caroline | abt 1820 | Down, Ireland | Head | Newtown, Montgomeryshire | | Daniel Callogan | | abt 1811 | Down St, Ireland | Lodger | Monmouth, Monmouthshire | | Anne Casson | | abt 1825 | Trenng, Down, Ireland | Wife | St Woollos, Monmouthshire | | Thomas Clarke | | abt 1829 | Down, Ireland | Visitor | Haverfordwest St Thomas, Pembrokeshire | | Peter Collins | | abt 1805 | County Down, Ireland | Head | Llanelly, Carmarthenshire | | Hugh M Comiskey | | abt 1825 | Down Pabrick, Ireland | Soldier | St Peter, Carmarthenshire | | Robert Connor | | abt 1820 | Beltinbet, Down, Ireland | Private 77 Ryr (Private) | St Woollos, Monmouthshire | | Samuel Cowen | | abt 1819 | Down, Ireland | Private | Cardigan St Mary, Cardiganshire | | John Crone | | abt 1794 | Down, Ireland | Lodger | Wrexham Regis, Denbighshire | | William Dines | | abt 1825 | Warrington, Down, Ireland | Private 77 Ryr (Private) | St Woollos, Monmouthshire | | Jane Donnan | Samuel | abt 1788 | Down, Ireland | Wife | Amlwch, Anglesey |
| | James Dunn | | abt 1830 | Down, Ireland | Visitor | Holywell, Flintshire | | Catherine Feran | James,
Mary | abt 1834 | Down, Ireland | Daughter | Holywell, Flintshire | | James Feran | Mary | abt 1819 | Down, Ireland | Head | Holywell, Flintshire | | Mary Feran | James | abt 1811 | Down, Ireland | Wife | Holywell, Flintshire | | Mary Ann Feran | James,
Mary | abt 1846 | Down, Ireland | Daughter | Holywell, Flintshire | | John Fitzpatrick | | abt 1791 | Down, Ireland | Servant | Greenfield, Flintshire | | Thomas Fullerton | | abt 1820 | Down, Ireland | Visitor | Holywell, Flintshire | | Thomas Greer | | abt 1826 | Dounpatrick, Down, Ireland | Private 77 Ryr (Private) | St Woollos, Monmouthshire | | James Hanratty | Barbara Ellen | abt 1811 | County Down Newsy, Ireland | Head | Abergavenny, Monmouthshire | | James Henning | Elizabeth | abt 1784 | Down, Ireland | Head | Wrexham Regis, Denbighshire | | John Kelly | | abt 1825 | Hilltow, Down, Ireland | Private 77 Ryr (Private) | St Woollos, Monmouthshire | | Thomas Kenedy | | abt 1791 | Down, Ireland | Lodger | Wrexham Regis, Denbighshire | | Joseph Levingston | | abt 1826 | Befast, Down, Ireland | Corporal 77 Ryr (Corporal) | St Woollos, Monmouthshire | | John Lewis | | abt 1799 | Carmarthen, Down, Ireland | Head | Swansea, Glamorgan | | Thomas Lindsay | | abt 1819 | Castle Willing, Down, Ireland | Private 77 Ryr (Private) | St Woollos, Monmouthshire | | James Mackin | | abt 1811 | Down, Ireland | Lodger | Brecon St Mary, Breconshire | | Thomas Macv | | abt 1806 | Down, Ireland | Visitor | Tyddyn Prydd, Montgomeryshire | | Hugh Magee | Mary | abt 1811 | Down, Ireland | Head | Holywell, Flintshire | | Joseph Mais | | abt 1825 | Ballynahinck, Down, Ireland | Private 77 Ryr (Private) | St Woollos, Monmouthshire | | Barnard McArn | | abt 1827 | Ballyarbima, Down, Ireland | Lodger | Swansea, Glamorgan | | James McBeady | Martha | abt 1816 | Down, Ireland | Head | Beddgelert, Caernarvonshire | | Ceicela McCormack | Micheal | abt 1805 | Down, Ireland | Wife | Saltney, Flintshire | | Micheal McCormack | Ceicela | abt 1801 | Down, Ireland | Head | Saltney, Flintshire | | Thomas Mc Coy | | abt 1794 | Down, Ireland | Lodger | Wrexham Regis, Denbighshire | | Thomas Mc Coy | | abt 1825 | Down, Ireland | Lodger | Wrexham Regis, Denbighshire | | Elizabeth McDonald | Hugh | abt 1802 | County Down Ireland | Wife | Swansea, Glamorgan | | Henry McDonald | Hugh,
Elizabeth | abt 1829 | County Down Ireland | Son | Swansea, Glamorgan | | Hugh McDonald | Elizabeth | abt 1802 | County Down Ireland | Head | Swansea, Glamorgan | | John McDonald | Hugh,
Elizabeth | abt 1827 | County Down Ireland | Son | Swansea, Glamorgan | | Banan McGoaw | | abt 1791 | Down, Ireland | Head | Holywell, Flintshire | | Bridget McGoaw | Banan | abt 1839 | Down, Ireland | Daughter | Holywell, Flintshire | | Lawrence McGoaw | Banan | abt 1835 | Down, Ireland | Son | Holywell, Flintshire | | Mary McGoaw | Banan | abt 1831 | Down, Ireland | Daughter | Holywell, Flintshire | | Sarah McGoaw | | abt 1806 | Down, Ireland | Sister | Holywell, Flintshire | | Thomas Mc Kenna | | abt 1816 | Down, Ireland | Lodger | Wrexham Regis, Denbighshire |
| | Catherine McKevitt | | abt 1823 | Down, Ireland | Lodger | Wrexham Regis, Denbighshire | | Thomas McKevitt | | abt 1819 | Down, Ireland | Lodger | Wrexham Regis, Denbighshire | | Patrick McVeigh | Elizabeth | abt 1805 | Down, Ireland | Head | Holywell, Flintshire | Owen Miggwiggan  | | abt 1811 | Down, Ireland | Visitor | Holywell, Flintshire | | Edward Moor | | abt 1804 | Down, Ireland | Lodger | Holywell, Flintshire | | Ann Morgan | | abt 1834 | West Down, Devon, England | Servant | Swansea, Glamorgan | | Ann Morgan | | abt 1834 | Darton West, Down, Ireland | Servant | Swansea, Glamorgan | | Fredrick Morris | | abt 1838 | Combe Down, Somerset, England | Nephew | Aberdare, Glamorgan | | John Murphy | Mary | abt 1816 | CO Down, Ireland | Head | Trevethin, Monmouthshire | | Mary Murphy | John | abt 1818 | CO Down, Ireland | Wife | Trevethin, Monmouthshire | | William Murphy | John,
Mary | abt 1838 | CO Down, Ireland | Son | Trevethin, Monmouthshire | | Patrick Oneil | Margaret | abt 1812 | Down, Ireland | Head | Holywell, Flintshire | | Elizath Jane Osborne | | abt 1831 | Com, Down, Ireland | Servant | Newport, Monmouthshire | | George Osborne | Priscilla | abt 1820 | Coombe Down, Somerset, England | Head | Cardiff St John, Glamorgan | | Priscilla Osborne | George | abt 1821 | Coombe Down, Ireland | Wife | Cardiff St John, Glamorgan | | John Porter | Isabella | abt 1805 | Hillsborough, Down, Ireland | Head | Swansea, Glamorgan | | Thomas Price | John,
Mary | abt 1828 | Down, Breconshire, Wales | Son | Llanelly, Breconshire | | Hanna Quin | Terance | abt 1826 | Down, Ireland | Wife | Aberdare, Glamorgan | | Terance Quin | Hanna | abt 1824 | Down, Ireland | Head | Aberdare, Glamorgan | | Terance Quin | Terance,
Hanna | abt 1845 | Down, Ireland | Son | Aberdare, Glamorgan | | John Quinlan | | abt 1828 | Down, Ireland | Lodger | Merthyr Tydfil, Glamorgan | | John Ratcliffe | Elizabeth | abt 1820 | Down, Ireland | Head | Swansea, Glamorgan | | Ann Richards | | abt 1823 | Down, Cardiganshire, Wales | Mar | St Dogmaels, Cardiganshire | | Ann Roch | | abt 1825 | Down, Ireland | Lodger | Holywell, Flintshire | | Catherine Roch | | abt 1819 | Down, Ireland | Lodger | Holywell, Flintshire | | John James Roonie | | abt 1823 | Newry CO Down, Ireland | Lodger | Llanelly, Breconshire | | Mary Ryan | | abt 1830 | Down, Ireland | Servant | Sesswick, Denbighshire | | Peter Ryans | | abt 1821 | Down, Ireland | Lodger | Holywell, Flintshire | | Mary Stephens | John | abt 1796 | Down, Breconshire, Wales | Wife | Llanelly, Breconshire | | Elizabeth Thomas | Henry,
Keturah | abt 1823 | Hwest, Down, Ireland | Daughter | Marloes, Pembrokeshire | | George Thomas | Henry,
Keturah | abt 1822 | Hwest, Down, Ireland | Son | Marloes, Pembrokeshire | | Martha Thomas | Henry,
Keturah | abt 1825 | Hwest, Down, Ireland | Daughter | Marloes, Pembrokeshire | | Mary Jane Todd | | abt 1831 | East Down, Devon, England | Visitor | Swansea, Glamorgan | | Rose Trenor | | abt 1822 | ??, Down, Ireland | Servant | Llansadwrn, Carmarthenshire | | Ann Tucker | Richard | abt 1813 | West Down, Devon, England | Wife | Swansea St Mary, Glamorgan | | Richard Tucker | Ann | abt 1813 | West Down, Devon, England | Head | Swansea St Mary, Glamorgan | | Richard Walsh | | abt 1825 | Down, Ireland | Private | Cardigan St Mary, Cardiganshire | | Samuel Walsh | | abt 1824 | Hilston, Down, Ireland | Trupmester Lyrant | St Woollos, Monmouthshire | | Waller Walsh | | abt 1823 | Down, Ireland | Corporal | Cardigan St Mary, Cardiganshire | | James White | | abt 1806 | Ross Traver C Down | Lodger | Swansea, Glamorgan | | Catherin Wilker | | abt 1842 | Little Down, Glamorgan, Wales | Niece | Llanfrechfa, Monmouthshire | | Burchard Wright | | abt 1827 | Llond County Down, Ireland | Visitor | Bangor, Caernarvonshire |
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