This page will be misc marriages.   The first group  has been submitted to me by Phyllis Cotter.    Thank you Phyllis.
Dubuque County, Iowa Records
Film # 1035387  LDS Family History Library, Salt Lake City, Utah
 Marriage Records, Book 3
  Page 114 Garret Cotter (23) and J??? Cunningham (19) an application of
said Cotter and satisfactory proof of liscence issued this 24 day of Jan
1869 (no solemnization entry)
  Page 570 John H. Pickards (35) and Mary Ann Cotter (29) License issued 7
July 1873  Solemnized 8 July 1873 by J. S. Bingham

Film #1035402 Marriage Records Book 4
 Page 103  Daniel Cotter (34) and Susan A Sweeney (32) Liscense issued 15
Nov 1875        No record Solemnization.
 Page 124 D. J. Kirwin (27) and Mary C. Cotter (23) License issued 18 Feb 1876
  Solemnized 24 Feb 1876 at Farley, Iowa by Re. C. J. McGavin
 Page 257 John Cotter (25) and Bridget O'Connel (23) Liscense issued 15 Feb 1878
  No record of solemnization  (But we have a copy of that)
 Page 406 William Cotter (30) and Margaret Casey (28) License issued 19 May 1880
  Solemnized Bankston 25 May 1880

Source | Dubuque Co., IA Marriage Books of   | Film# 1035387 , 1035386 , 1035402
  Data  | LDS Genealogy Library Salt Lake City, UT
Film# 1035387             Book 3 Page 227
  John J O'Connell  | On application of said O'Connell and satisfactory
proof
  Margaret O'Connell| License issued this 3rd day of September 1868
   The  marriage  of the above named parties was solemnized on the  8  day
of  September 1868 By C.J. Mc Gaurana Pastor of St Clements Church
Book 3 Page 364
  D.D. O'Connell    | On Application of said O'Connell and satisfactory
proof
  Catharine O'Regan | License issued 23rd day of May 1870
    The marriage of the above named parties was duly solemnized by Chas J.
Mc Gauran a Catholic Priest on the 24 day of May 1870

Film# 1035386             Book A Page 127
  Lawrence Duggan   |
  Ellen O'Connell   |
   I  the  undersigned certify that I have joined the above  mentioned
couple according to the rites of the Catholic Church  Dubuque  July 27,1850, Mathias Loras
Book 1 Page 3
  Hugh Lennan       |   License issued 23 Aug. 1851
  Ann O'Connell     |  License recorded 14 Nov 1851
           Solemnized 28 Aug 1851        Certificate returned by J.F. Treecy, M.G.
Film# 1035402      Book 5 Page 5
  James J. O'Connell | Age 27
  Annie M. Schemmel  | Age 20 , 18 Apr 1883
Book 5 Page 38
  Daniel J. O'Connell | Age 30
  Annie Mc Coy        | Age 22, I failed to note date, probably 1883
  Page 114 Garret Cotter (23) and J??? Cunningham (19) an application of
said Cotter and satisfactory proof of liscence issued this 24 day of Jan
1869 (no solemnization entry)
  Page 570 John H. Pickards (35) and Mary Ann Cotter (29) License issued 7
July 1873  Solemnized 8 July 1873 by J. S. Bingham
Film #1035402 Marriage Records Book 4
 Page 103  Daniel Cotter (34) and Susan A Sweeney (32) Liscense issued 15
Nov 1875     No record Solemnization.
 Page 124 D. J. Kirwin (27) and Mary C. Cotter (23) License issued 18 Feb 1876
  Solemnized 24 Feb 1876 at Farley, Iowa by Re. C. J. McGavin
 Page 257 John Cotter (25) and Bridget O'Connel (23) Liscense issued 15 Feb 1878
  No record of solemnization  (But we have a copy of that)
 Page 406 William Cotter (30) and Margaret Casey (28) License issued 19 May 1880
  Solemnized Bankston 25 May 1880

Source | Dubuque Co., IA Marriage Books  of   | Film# 1035387 , 1035386 , 1035402
  Data  | LDS Genealogy Library Salt Lake City, UT
Film# 1035387              Book 3 Page 227
  John J O'Connell  | On application of said O'Connell and satisfactory
proof
  Margaret O'Connell| License issued this 3rd day of September 1868
   The  marriage  of the above named parties was solemnized on the  8  day
of  September 1868 By C.J. Mc Gaurana Pastor of St Clements Church
Book 3 Page 364
  D.D. O'Connell    | On Application of said O'Connell and satisfactory
proof
  Catharine O'Regan | License issued 23rd day of May 1870
    The marriage of the above named parties was duly solemnized by Chas J.
Mc Gauran a Catholic Priest on the 24 day of May 1870

Film# 1035386              Book A Page 127
  Lawrence Duggan   |
  Ellen O'Connell   |
   I  the  undersigned certify that I have joined the above  mentioned
couple according to the rites of the Catholic Church  Dubuque  July 27,
1850, Mathias Loras

Book 1 Page 3
  Hugh Lennan       |   License issued 23 Aug. 1851
  Ann O'Connell     |  License recorded 14 Nov 1851
           Solemnized 28 Aug 1851
           Certificate returned by J.F. Treecy, M.G.

Film# 1035402         Book 5 Page 5
  James J. O'Connell | Age 27
  Annie M. Schemmel  | Age 20 , 18 Apr 1883
Book 5 Page 38
  Daniel J. O'Connell | Age 30
  Annie Mc Coy        | Age 22, I failed to note date, probably 1883
Other O'Connells listed:
Book 4 Page 3
  Wm. O'Connell to Mary Syrick 26 May 1871

 Film# 1035386             Book 2 Page 208
  Daniel O'Connell & Catharine Cashman 9 Apr 1861
Book 2 Page 417
  Daniel O'Connell & Mary Sullivan 9 Aug 1864
Book A Page 140
  John O'Connell & Ellen Ragan 7 Nov 1850, Mathias, Bishop of Dubuque

Film# 1035387           Book 3 Page 472
  Daniel O'Connell & Elizabeth Foley, license issued 26 Dec 1871
     Solemnized 3 Jan 1872 by James Kelley, Catholic Priest
Book 3 Page 228
  James O'Connell & Mary Sullivan, license issued 10 Sep 1868
      Solemnized 13 Sep 1868 by Michael Kinsella, Catholic Priest

Other O'Connells listed in Index to Marriages:
1850   John O'Connell     Book A Page 140
1856   Julia O'Connell    Book 1 Page 388
           Dennis O'Connell   Book 1 Page 486
           Thomas O'Connell   Book 1 Page 490
1857 Patrick O'Connell  Book 1 Page 576
1858   Callahan O'Connell Book 2 Page 32
1859   Bridget O'Connell  Book 2 Page 128
1860    Mary O'Connell     Book 2 Page 149
1864    Michael O'Connell  Book 2 Page 433

The following marriages were gathered in many different ways.  From census information when an in-law is living with the married couple, marriage  records that have shown up on those that I copied and so forth.  I cannot  verify that they were married in Dubuque but have listed those (only) that I think were.  So please, don't assume that the information is correct until you check it out.  I have given a year if possible.  Also, keep in mind that just because a mother-in-law is living with the married couple, it could be that she was remarried and the daughter had a different last name.  Still, I feel, this could help someone in their search.
male                             female                   Approx. date
Herman Lipman      Anna Goldstein     1894
M. Klein                  M Teressa Pinnel
John Zaruke           Amelia Frank            1900
George Pohl           Louise Widmeyer      1900
Henry Bechtel        Elise Gobat                1887
John Sutherland     Jimminia Morrison    1884
John Klein              Elizabeth Gommerich  1887
_ Schlenker           Annie Rehbaum            1875
Joseph Sitterly       Pauline Hense
Allen Bush            _ Kramer                      1897
John P Merkes       Mary Kleinschmidt    1893
John Schappel        Crescentia Haisch     1892
Edward Mueller      Catherine Wirsbeck   1864
Nic Laukes             Elizabeth Knabel         <1874
Conrad Lang         Anna Hermes              1877
Nicholas Comes    Catherine Lindon      <1868
Peter Busch           Mary Dahling            abt. 1878
Joseph LaBrush     Anna Berd                 <1880
John Cooney        Elizabeth Gandolfe    abt. 1875
Simeon Clark        Eliza J. Brown             May 22, 1866
Joseph Auderer    Elizabeth Kessler        Jun 1866
Nicholas Walch   Clara Kemp                Jun 1866
Edwar Specht       Louisa Felthouse        March 1864
Joseph Schuller    Catherine Eppendorf   abt. 1862
Edward Thode      Mary Berry                  1899
James Keefe          Agnes Dolan               1895
James Guthrie       Hattie Dowdell           1893
Andrew McDonald  Teressa Donehoe    1892
A. Cooper              Georgia Hamilton      1899
Samuel Kapald      Bertie Goldberger       1885
Patrick Kirley         Anna McFall                 1898
Charles Greenwood  Ella Dixon                 1888
Henry Reuss            Rosa McCaffrey           1898
Edward McKenna    Maggie Webber         1896
William Jones            Augusta Weber        <1880
Horatio Nelson        Mollie  Johnson        <1880
William Griffin         Alveda Johnston        <1880
Thomas Meredith    Susan Gonder            <1880
John Carroll             Sarah Clark                 <1880
Lawrence Flynn       Mary Conners             1886
Peter Mosch            Catherine Heber          1897
William Mack         Mary Meyer                  1868
Henry Schmierbach  Cresence Claus        1896
George Witter        Lena Hammerand        1861
Christian Hoch       Amelia Hardt                1876
Mathias Gansmer    Anna Schmal               1896
Hohn Heiman        Hannah Pabst                1888