O' Mara
From the Law Directory (not listed at stated address)
T. P., Lisanishea, Blackrock (barrister - Trinity term 1839)
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O'Meagher
William, 16 South Frederick St (barrister - Hilary term 1834)
From the Law Directory (not listed at stated address)
Joseph, 57 Rutland Sq West (solicitor)
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O'Mealey
James, 108 Lower Mecklenburgh St (furnished lodgings)
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O'Mealley
Michael, 11 Northumberland Sq (not listed at address)
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O'Mealy
William, 12 Lower Gloucester place (occup not listed)
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O'Meara
Denis P., 4 Swift's row (solicitor's chambers)-listed as D.F. in street listing
John, 6 Charlemont parade (Custom House)
John B., 16 Sir John Rogerson's Quay (grocer and spirit dealer, post office receiver, coal factor and ship agent)
Valentine, 41 Mabbot St (solicitor)
From the Law Directory (not listed at stated address)
John, no address (barrister - Easter term 1842)
Valentine, 41 Wellington quay (solicitor)
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O'Moore
John Edmund, 5 Holles St (barrister)
John Edmond, 10 Henrietta St (barrister)-listed as Moore in street listing
From the Law Directory (not listed at stated address)
E., 50 Blessington St (barrister - Hilary term 1837)-address listed as vacant
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O'Neal
James, 10 Chatham lane (victualler) - spelt O'Neill in general listing
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O'Neale
Edward K., 74 Aungier St (paper warehouse, painter etc.)
Thomas, 62 Mary's lane (tailor)-spelt O'Neill in general listing
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O'Neill
and Carroll, 52 Fleet St (booksellers)
and Duggan, 8-9 Dame St (stationer)
and Grady, 13 Nassau St (baby linen warehouse)
Alicia, 23 South Frederick St (milliner)
Andrew, 40-41 Upper Kevin St (harness, gig and jaunting-car maker)
Anthony, 5 Flood's buildings (coach builder)
Anthony, 7 North Strand (job carriage establishment)
Arthur, 46 Mary's lane (dairy)
Bernard, 75 Cook St (undertaker)
Charles, 12 Ash St (silk manufacturer)
Charles Henry, 21 Blessington St (barrister)
Mrs. E., 14 Mark St (leech importer)
Edmund J., 24 Bayview avenue (occup not listed)
Edward, 67 Phibsborough Road (occup. not listed)
Edward, 82 Thomas St (clothes broker)
Eliza, 56 Stephen St (milliner)
George, 24 Upper Bridge St (boot maker)
H., 4 Little Longford St (bookbinder)
Miss H.B., 10 Bessborough terrace (occup not listed)
Henry, 84 Great Britain St (boot and shoe maker)
J., Newcomen bridge (copperplate printer)
J.P., 8 Bessborough terrace (merchant tailor)
James, 49 Fishamble St (carpenter)
James, M.D., 7 Bessborough terrace (doctor of medicine)
James, 35 Dolphin's barn lane (tanner)
James, 5 Johnson's place (grocer)
James, 9 South Anne St (grocer, tea, wine and spirit dealer)
James, 12 Swift's row (wholesale spirit merchant)
James, 10 Chatham lane (victualler) - spelt O'Neal in street listing
Jane, 47 High St (boot maker)
John, 23 South Frederick St (coal merchant)
John, 26 and 107-109 Cork St (tanner and currier)
John, 52 Fleet St (coal factor)
John, 25 Whitefriar St (tin plate worker)
John, 57 Stephen St (vintner)
John, 23 Little Ship St (tin plate worker)
John, 25 Lower Mecklenburgh St (occup not listed)
John, 84 Lower Mecklenburgh St (occup. not listed)
John, 2 Synnott St (printer)
Louis G., 21 Blessington St (solicitor)
M., 5 Wellington place (occup. not listed)
Michael, 4 Upper Exchange St (boarding house)
Mrs., 17 Upper Camden St (dress and baby linen warehouse)
Mrs., 28 South Frederick St (occup. not listed)
Mrs., 28 James' St (occup. not listed)
Neal John, 9 Lower Gloucester St (solicitor)
Owen, 22 Old Church St (baker)
Patrick, 79 Prussia St and 3 Upper Ormond Quay (tailor and draper)
Patrick, 17 Hanover lane (clothes broker)
Peter, 34 Patrick St (clothier)
Pierce, 74 Stephen St (provision dealer)
Susan, 45 North Wall quay (vintner)
Terence, 117 North King St (dairy)
Thomas, 77 James' St (malster)
Thomas, 62 Mary's lane (tailor)-spelt O'Neale in street listing
Thomas, 21 Bride St (dairy)
Thomas, 220 Great Britain St (provision stores)
Thomas, 112 Cork St (malster)
Timothy, 45 Amiens St (hotel and tavern)
William, 114 James' St (occup. not listed)
William, 88-89 Lower Camden St (job carriage and funeral establishment)
From the Law Directory (not listed at stated address)
Michael J., no address (barrister - Michaelmas term 1843)
C.C., Drumderry House (barrister - Trinity term 1846)
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Orchard
M., 35 Wellington St (occup not listed)
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Ord
32 Tighe St (veterinary establishment)-no initial or first name
John, 115-116 Cork St (tanner)
Thomas, 24 Dolphin's barn and 83 Cork St (tanner)
Thomas, 25 High St (leather merchant)
Thomas, 34 Thomas St (starch manufacturer)
William, 82-83 Cork St (tanner)
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O'Reardon
John, M.D., 35 York St (doctor)
From the Law Directory (not listed at stated address)
J. Charles, 49 York St (solicitor)
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O'Regan
Rev. J., St. Catherine's Church, Thomas St (curate)
John, 30 North Cumberland St (not listed at address)
Rev. John, 6 Wesley terrace 
Miss, 100 Lower Baggot St (occup not listed)
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O'Reilly
and Co., 36 Great Brunswick St (plumbers, brass founders and gas fitters)
and Haswell, 82 Grafton St (family mourning warehouse)
Andrew, 27 Bolton St (solicitor)
Arnold, 50 Patrick St (vintner)
Bartholemew, 8 Royal Canal Bank (occup not listed)
Caliph Barns, 25 North Summer St (solicitor)
Miss Catherine, 11 Marlborough St (lodging house keeper)
Charles, M.D., 3 Lower Dominick St (doctor)
Christopher, 16 Upper Bridge St (not listed at address)
Cornelius, 16 Upper Bridge St (hosiery)
Edward, 56 Meath St (grocer)
Edward, 78 North King St (provision dealer)
George, 92 Lower Camden St (licensed, French brandy and Jamaica Rum)
Gilbert S., Rehoboth cottage, South Circular Road (occup not listed)
James, 1 Usher's quay (spirit dealer)
James, 27 Bolton St (solicitor)
James, 9 Wormwood gate (hotel keeper)
Mrs. Jane, 55 Marlborough St (dress maker)
John, 7 Elephant lane (bookseller)
John, 54 Jervis St (land surveyor)
John, 8 Chancery lane (licensed tobacconist)
John, 1 Victoria terrace (land surveyor)
John Charles, 26 Lower Gloucester St North (Esq.)
Joseph, 2 James' terrace (tenements-indiv occups not listed)
Joseph, 63 Capel St (stationer and bookseller)
Joshua, 45 Eccles St (Esq.)
Michael, 184 Great Britain St (bookseller and stationer)
Michael, 37 South Great George's St (druggist)
Michael, Marshall lane (barm brewery)
Michael, 36 Barrack st (vintner)
Myles, 5 Margaret place (solicitor)
Patrick, 7 North Earl St (grocer)
Peter, 35 Thomas St (victualler)
Richard and Co., 30 College green (Irish poplin and tabinet maker)
Richard A., Upper Queen's Inns Chambers and Knockingin, Balbriggan (barrister - Hilary term 1837)
Richard Pierce, 62 Upper Sackville St (doctor of medicine)
Terence, 94 Summerhill (occup not listed)
Thomas, 81 James' St (starch manufactory)
William, 1 Newcomen terrace (clerk, Bank of Ireland)
From the Law Directory (not listed at stated address)
Dowell, Attorney General of Samaria
Edward S., no address (barrister - no date given)
Francis, 21 Great Brunswick St (solicitor)
Hugh, 24 Summerhill (solicitor)
James W., 31 Upper Dorset St (solicitor)-address listed as vacant
Mathew, 31 Upper Dorset St (solicitor)-address listed as vacant
R.J., 5 Margaret place (barrister - Trinity term 1829)
Terence, 18 Lower Dominick St (solicitor)
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Orford
Mrs., 43 Kildare St (Kearns' Hotel - proprietress)
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Orme
Miss, 11 Pembroke Road (occup not listed)
Robert, 7 Lower Gardiner St and 2 Henrietta St (proctor - solicitor)
Mrs. William, 32 Upper Pembroke St (occup not listed)
From the Law Directory (not listed at stated address)
Francis Knox, 32 Upper Pembroke St (barrister - Easter term 1842)
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Ormsby
Tilly, and Hamilton, 11 Henrietta St (proctors)
Henry, 23 Upper Rutland St (barrister - Michaelmas term 1835)-spelt Ormsly in street listing
Joseph, 2 Wellington place (occup not listed)
Miss, 11 Hatch St (occup not listed)
Mrs., 12 Upper Rutland St (occup not listed)-spelt Ormsly in street listing
Mrs., 109 Upper Dorset St (occup not listed)-spelt Ornsby in street listing
Mrs., 2 Fitzwilliam Sq West (occup not listed)
From the Law Directory (not listed at stated address)
Arthur, 11 Henrietta St (proctor)
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Ormsly
Henry, 23 Upper Rutland St (barrister - Michaelmas term 1835)-spelt Ormsby in general listing
Mrs., 12 Upper Rutland St (occup not listed)-spelt Ormsby in general listing
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Ornsby
Mrs., 109 Upper Dorset St (occup not listed)-spelt Ormsby in general listing
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O'Rorke
Hugh and Co., 28 New Row (hardware merchants)-spelt O'Rourke in street listing
From the Law Directory (not listed at stated address)
Alexander, 19 Upper Ormond quay (solicitor)
Daniel, 21 Blessington St (solicitor)
Edward, 21 Blessington St (solicitor)
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O'Rourke
Hugh and Co., 28 New Row (hardware merchants)-spelt O'Rorke in general listing
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Orpen
John Herbert, 13 South Frederick St (barrister - Hilary term 18?7 - date unclear - possibly 1837)
Richard J. Theodore, 41 North Great George's St and Ardtully, County Kerry (solicitor)
From the Law Directory (not listed at stated address)
Edward, no address (barrister - Trinity term 1839)
Francis Fitzrichard, no address (barrister - Michaelmas term 1848)
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Orpin
Basil, 61 Harcourt St (solicitor)
John, 17 Dame St and Highthorn, Monkstown (solicitor)
William, 38 Aungier St (Esq.)
From the Law Directory (not listed at stated address)
William B., Highthorn, Monkstown (barrister - Easter term 1846)
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Orr
J., Royal Barracks, Barrack St (barrack master)
James, 73 Upper Baggot St (Esq.)
John, 155 North King St (boot and shoe maker)
John Augustine, 22 Lower Baggot St (A.B.)
M., 51 Lower Baggot St (surgeon)
Mrs., 37 Lennox St (occup not listed)
Robert, 5 Adelaide Road, South Circular Road (Esq.)
Thomas, 26 Lower Rutland St (occup not listed)
William, 27 North Great George's St (painter and glazier)
From the Law Directory (not listed at stated address)
Alexander S., 22 Lower Baggot St (barrister - Easter term 1841)
J., 17 Mountjoy Sq North (barrister - Hilary term 1847)
Moore, 13 Upper Ormond Quay (solicitor)
William, 73 Abbey St (solicitor)
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Orson
James, 34 Jervis St (coach maker)
Mrs., 69 Middle Abbey St (dress maker)
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Osborne
George, 55 South Great George's St (cutler)
George, 55 Jervis St (gas fitter)
Jonathan, 26 Harcourt St (M.D., doctor)
Joseph, 10 Adelaide Road (Esq.)
Mrs. M., 16 Clanbrassil place (occup not listed)
Mrs., 18 Warrington place (occup not listed)
Thomas, 11 Cannon St (fancy cage maker)
Sir Toler, Bart., 11 Seville place 
William, 6 Cannon St (general turner)
From the Law Directory (not listed at stated address)
R.B., no address (barrister - Trinity term 1817)
Robert W., 15 Lower Leeson St (barrister - Hilary term 1845)
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Osbrey
and Mullen and Co., 11 Parliament St (salesmen)
Gerald, 28 Molesworth St (surgeon)
Gerald, 1 Prussia St (physician)
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O'Shaughnessy
and Kelly, 24 Wellington quay (solicitors)
E., 7 Cork St (barm brewer)
Edward, 155 Thomas St (provision dealer)
James, 24 Wellington quay (solicitor)
James, 17 Upper Baggot St (solicitor)
John Joseph, 12 College green (engraver)
Joseph, Fish Market (factor)
Michael, 6 Lower Gardiner St (barrister - Hilary term 1828)
Mrs., 25 Upper Baggot St (occup not listed)
Thomas, Fish Market (factor)
Thomas, 11 Back lane (provision dealer)
William, 90 Capel St (not listed at address)
From the Law Directory (not listed at stated address)
Russell, 29 Upper North Cumberland St (solicitor)
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O'Shea
Luke, 5 Upper Sherrard St (solicitor)
Mrs., 19 Montpelier Hill (Royal Military Infirmary)
From the Law Directory (not listed at stated address)
Henry, 180 Great Brunswick St (solicitor)
Hatton Conron, no address (barrister - Trinity term 1834)
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O'Sullivan
C., 170 Old Church St (comb maker)
John, 202 Great Brunswick St (solicitor)-listed as barrister in street listing
John and Co., 17 Watling St (Spanish leather manufacturer)
William, 7 Middle Mountjoy St (carpenter)
From the Law Directory (not listed at stated address)
Edmond, 19 Upper Ormond quay (solicitor)
John, no address (barrister - Easter term 1813)
Robert, Limerick (solicitor)
W. Keane, 50 Denzille St (solicitor)
William, no address (barrister - Trinity term 1844)
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Othivell
From the Law Directory (not listed at stated address)
William, 92 Middle Abbey St (solicitor)
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O'Toole
Catherine, 1 Merrion row (wine and spirit stores)
J.M., 14 Hawkins' St (printing office)
James J., 126 Stephen's green West (blind manufacturer)
John, 14 North Anne St East (occup not listed)
John, 23 Great Britain St (tin-plate worker)-listed as Toole
John, 57 Golden lane (boot and shoe maker)
Laurence, 2 Upper Liffey St (cabinet maker)
Mrs., 3 Brougham place (occup not listed)
Timothy, 2 Lower Kevin St (hair dresser)
Timothy, 28 Golden lane (hair dresser)
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Otway
John Hastings, 86 Lower Leeson St (barrister - Hilary term 1832)
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Ould
Rev. D. Fielding, 12 Great Charles St 
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Oullahan
William, 4 Sir John Rogerson's quay (block pump maker)-spelt Oullahand in street listing
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Oullahand
William, 4 Sir John Rogerson's quay (block pump maker)-spelt Oullahan in general listing
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Oulton
and Gallie, 33 Dame St (ironmongers)
and Gallie, St. Andrew's lane (forge and workshop)
and Pettigrew, 1 St. Andrew St (printers)
Plato, 183 Great Brunswick St (stationer)
From the Law Directory (not listed at stated address)
Andrew N., 1 St. Andrew St (barrister - Hilary term 1830)
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Oven
William, 7 Church lane South East (tailor)
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Overend
William, 38 Upper Rutland St (barrister -Trinity term 1841
William, 25 Great Brunswick St (barrister)
William Burke, 110 Lower Gardiner St (Esq.)
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Owen
Frederick, 23 Bayview avenue (occup not listed)
James H., 2 Mountjoy Sq West (architect and engraver)
Jacob, 2 Mountjoy Sq West (architect and engraver)
Mrs., 56 Upper Leeson St (occup not listed)
Robert H., 20 Upper Pembroke St (barrister - Easter term 1839)
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Owens
George B., 25 Kildare St (doctor of medicine and apothecary)
Henry, 113 Summerhill (occup not listed)
John, 150 James' St (corn chandler)
Joseph, 89 Thomas St (rope manufactory)
Pat., 33 Lower Liffey St (carpenter)
From the Law Directory (not listed at stated address)
Thomas, Mount Granville, Co. Meath (barrister - Hilary term 1785)
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Oxberry
Thomas, 10 Charles St West (smith broker)-spelt Oxbury in general listing
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Oxbury
Thomas, 10 Charles St West (smith broker)-spelt Oxberry in street listing
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Oxley
Christopher, 25 Stephen St (broker)
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