The following is a table sorted by the Bride's surname of Baltimore County Marriage Licenses issued from January 1800 through December 1816.
| Bride Surname | Bride Given Name | Groom Surname | Groom Given Name | Minister Name | Date |
|---|---|---|---|---|---|
| O'BRIAN | Catharine | BURKE | Richard | Carroll | 19 Apr 1800 |
| O'BRIAN | Eleanor | BURNS | Patrick | Cuddy | 14 Feb 1804 |
| O'BRIAN | Elizabeth | NASH | Ephraim |   | 23 May 1806 |
| O'BRIAN | Kitty | McGRATT | Thomas | Beeston | 21 Sept 1801 |
| O'BRIAN | Mary | HAHESY | John | Moranville? | 25 Aug 1806 |
| O'BRIAN | Sally | TENEY | Patrick |   | 13 Feb 1800 |
| O'BRYON |   | GROWARD | George M |   | 31 July 1813 |
| O'CONNER | Briddgett | KELLY | Patrick | Caroll | 10 Nov 1801 |
| O'CONNER | Catharine | PENMAN | John |   | 20 May 1815 |
| O'CONNER | Mary | HENDRICKSON | Daniel |   | 29 Nov 1806 |
| O'CONNOR | Sarah | GORMAN | Edward | Mertz | 10 Aug 1816 |
| O'DELL | Ktturah | O'DELL | Abraham |   | 10 Dec 1800 |
| O'DONNELL | Abagail | MATCHET | James |   | 23 Oct 1816 |
| O'DONNELL | Alice | BUTLER | John | Moranville | 17 Oct 1807 |
| O'DONNELL | Anne | FLANNAGAIN | Thomas | Mertz | 16 Nov 1816 |
| O'DONNELL | Deborah | POOR | Dudley |   | 14 May 1814 |
| O'DONNELL | Eleanor | GORMAN | Mr. | Beeston | 25 Oct 1800 |
| O'DONNELL | Eleanor | DEATER | William |   | 13 Dec 1804 |
| O'DONNELL | Margaret | GORDON | Benjamin | Moranville | 15 July 1811 |
| O'DONNELL | Mary | TWEEDALL | James |   | 19 Aug 1814 |
| O'DONNELL | Mary Elliot | BERRET | Joseph |   | 8 Mar 1809 |
| O'DONNELL | Sarah | HASKINS | Roger | Rattoone | 21 Nov 1805 |
| O'DRISHELL | Margaret | COLE | Richard | Bend | 3 Aug 1802 |
| O'HARRA | Julianna | BARKER | William |   | 5 Sept 1806 |
| O'MANSETTER | Abigail | SHILLING | Joseph |   | 6 Oct 1804 |
| O'NEAL | Mary | RICKETTS | David | Rossell | 14 Oct 1813 |
| O'NEALE | Rose | RIDER | Arthur |   | 6 Oct 1802 |
| O'REILLY | Catharine | GALISBEY | Patrick |   | 5 Feb 1816 |
| O'ROURKE | Marie R. C. | TALLAGE | Alexander J. B. D. | Beeston | 13 Oct 1802 |
| O'ROZEL | Octavia | WOODWARD | Thomas | Hemphill | 7 Oct 1816 |
| O'SULLIVAN | Elenn | DUPLANTE | Bertrand S |   | 5 Feb 1808 |
| OAKES | Eleanor | FRY/TRY? | James |   | 3 Mar 1810 |
| OATES | Rebecca Wirtter | LEE | Joseph |   | 18 Jan 1810 |
| ODLADE | Matilda | MULLEN | (illegible) C. |   | 18 Dec 1804 |
| ODLE | Matilda | WORTHINGTON | Nicholas D. |   | 15 Dec 1815 |
| ODOIN (Odorne) | Julia | WILLIS | John | DuBourg | 23 July 1807 |
| OEHRIENG | Mary | EHLEN | John | Kurtz | 1 June 1815 |
| OERRERT? | Polly | GREEN | James |   | 21 Apr 1801 |
| OGDEN | Henrietta | BANKER | John | Beeston | 26 Nov 1807 |
| OGG | Ann | CRISWELL | Elijah |   | 23 Mar 1813 |
| OGG | Eleanor | CONAWAY | Zachariah | Garretson | 30 May 1812 |
| OGG | Helen | JORDAN | William |   | 12 Jan 1814 |
| OGG | Rachel | WILLIAMS | John |   | 23 Nov 1816 |
| OGG | Sarah | HEDDINGTON | Laban | Garrettson | 24 Dec 1814 |
| OGLEBY | Deborah M. | BARTLESON | William | Annon | 2 May 1805 |
| OLAR | Louisa | THOMAS | John | Kurtz | 3 Aug 1805 |
| OLDHAM | Harriet | PEARCE | Charles | Dashiell | 18 June 1816 |
| OLDHAM | Maria A | MOORE | William | Dashield? | 5 Oct 1808 |
| OLDHAM | Mary Ann | SWEETSER | Samuel |   | 30 May 1816 |
| OLDOR | Nancy | MARSTON | Thomas |   | 15 Aug 1800 |
| OLER | Louess | BRAUGH | Ferdinand | Dryer | 22 Apr 1803 |
| OLER | Susanna | ROBINSON | Abraham | Kurtz | 24 Aug 1805 |
| OLEY | Avis | COOPER | John |   | 19 Feb 1812 |
| OLIVER | Margaret | CATE | Roswell S | Ingles | 5 Oct 1811 |
| OLIVER | Mary | COUSEY | Henry D. | Richards | 25 July 1800 |
| OLIVER | Rachel | LINCOLN | Reuben | Bend | 8 July 1800 |
| OLIVES | Bridget | DINMORE | Richard | Heley | 28 Aug 1806 |
| OLIVIER | Eliza M. | HINCHS | Joseph |   | 29 Oct 1808 |
| OLLIPHORT | Jane | THOMAS | Daniel L. | Ingles | 8 June 1807 |
| OLLIWORTH | Susanna | RANDALL | James | Rattoone | 20 May 1806 |
| OLRAGE | Mary Ann | NELSON | Joseph | Roberts | 27 Sept 1811 |
| OLSLER | Rachel | MANSEL | Henry |   | 7 Aug 1801 |
| OMENSETER | Susannah | WOODS | Luther |   | 26 Nov 1812 |
| OMENSETTER? | Elizabeth | BALINGER | Samuel | Shiner | 12 Oct 1812 |
| ONION | Caroline C. | EVANS | Isaac Jr. |   | 14 June 1809 |
| ONION | Eliza | TODHUNTER | Joseph | Otterbein | 11 Dec 1810 |
| ONION | Matilda | THOMAS | William |   | 19 Mar 1816 |
| OPERGRAFF | Hannah | OBERHUFF | Frederick | Kurtz | 18 Nov 1816 |
| ORABBERT? | Ann | THORNTON | Joseph | Richards | 14 July 1802 |
| ORAM | Achsah | MAGERS | George |   | 23 Oct 1806 |
| ORAM | Anastacia | MAGNESS | John |   | 14 Dec 1804 |
| ORAM | Rebecca | PEACOCK | William |   | 2 Nov 1815 |
| ORAM | Sarah | SHORTRIDGE | John | Roberts | 16 Feb 1810 |
| ORBAIN | Sophia | NAYLOR | Philip |   | 25 Mar 1809 |
| ORE | Catharine | SABEL | John |   | 3 Apr 1810 |
| ORELL | Ann | JOHNSON | Absalom | Wells | 15 May 1815 |
| ORM | Ann Verlinder | LAUDSTREET | John |   | 17 Apr 1811 |
| ORNE | Rhoda | CLARE | Alexander | McKean | 21 Oct 1805 |
| ORR | Ann | PEDEN | David | Duncan | 12 Aug 1814 |
| ORR | Isabella | DEEN | Henry |   | 25 Jan 1816 |
| ORR | Margaret | GRIMES | Mathew |   | 1 Dec 1807 |
| ORR | Molly | PATTER | Enoch | Nelson | 2 May 1803 |
| ORRICK | Ann | HOLLINGSWORTH | Thomas | (illebible) | 29 July 1800 |
| ORRICK | Ann | RIGDEN | John E. |   | 20 Oct 1808 |
| ORRICK | Elizabeth | JOHNSON | Samuel | Rockwell | 7 Jan 1812 |
| ORRICK | Jane | BROWN | John D. | Wells | 2 May 1804 |
| ORRICK | Susanna | WRIGHT | Robert |   | 23 Jun 1800 |
| ORSLER | Providence | HIPSLEY | Solomon |   | 17 Dec 1814 |
| OSBASNE | Elizabeth | BELL | John | Davis | 14 Apr 1801 |
| OSBORN | Elizabeth F. | GARRETTSON | Richard W. | McCaine | 5 Jan 1814 |
| OSBORN | Mary | CHRISTOPHER | Elijah |   | 10 Oct 1803 |
| OSBORN | Mary | FENTON | Eugane | Moranville | 17 June 1816 |
| OSBORN | Rebecca | HARLOW | Winslow | Rattoone | 19 Dec 1805 |
| OSBORN | Rhoda | KROW | Conrod | Kurtz | 6 Aug 1807 |
| OSBORN | Sarah | McCLEARY | William | Sinclair | 30 June 1803 |
| OSBORN | Sarah A. | FAIRBANK | Noah | Welsh | 22 Dec 1815 |
| OSBORNE | Clara | BUSBY | William |   | 11 May 1811 |
| OSBORNE | Flora | EWEN | James |   | 8 May 1816 |
| OSBURN | Phebe | GILL | Stephen | Butler | 1 May 1800 |
| OSBURN | Rachel | ARMAGOST | Adam |   | 5 Jan 1803 |
| OSGOOD | Elizabeth | FORESEDES | Thomas |   | 8 Dec 1802 |
| OSLER | Cartharine | WEER | Robert |   | 19 Feb 1803 |
| OSLER | Ruth | BOND | Peter | Butler | 1 Sep 1800 |
| OSNAT | Mary | ARNET | Cinrie | Moranville | 17 Aug 1816 |
| OSTRANDER | Elizabeth | KING | Richard |   | 28 Mar 1808 |
| OSTREN | Sarah | TULL / FULL | John | McKean | 11 Aug 1808 |
| OTTER | Catharine | WILHELM | Jacob | ?? | 20 May 1800 |
| OTTO | Ursula | McEVERS | Daniel | (illegible) | 16 Jan 1802 |
| OUGEL | Phoebe | WARD | James |   | 14 Jan 1812 |
| OURSLER | Allen | WOOLERY | Benjamin |   | 17 Apr 1807 |
| OURSLER | Ann | HANDS | Ephraim |   | 3 June 1808 |
| OURSLER | Lydia | MITTEN | John |   | 1 Jan 1812 |
| OURSLER | Nancy | GRIMES | Edward |   | 10 May 1811 |
| OUSLER | Margaret | WOOLEY | Christopher | Butler | 25 Mar 1800 |
| OVERHOF | Catharine | STASLER? | Philip | Carroll | 7 June 1803 |
| OVERHULTZ | Sarah | SMITH | James |   | 7 Dec 1816 |
| OVERLOOK? | Elizabeth | MILLER | John |   | 23 Jun 1800 |
| OVERSTREET | Teresse | JASON | John | Moranville? | 7 June 1813 |
| OVERY | Elizabeth | STOTT | Jacob |   | 8 Apr 1807 |
| OVERY | Mary | SAPP | Oliver | Kutz | 10 Mar 1813 |
| OWEN | Nancy | ASKEW | John | McClaine | 11 June 1814 |
| OWENS | Margaret | LEAK | Norris |   | 12 Mar 1810 |
| OWENS | Mary | LEWIS | Job | Kemp | 28 Aug 1816 |
| OWINGS | Achsah | OWINGS | Leavin | Kurtz | 25 July 1805 |
| OWINGS | Ann | STEVENS | James H. | Richards | 6 Feb 1813 |
| OWINGS | Ann | JESSOP | Dominick B. |   | 11 Jan 1813 |
| OWINGS | Ann | EDMONDSON | Robert | Wilson | 9 Oct 1813 |
| OWINGS | Arraminta | DORSEY | Eli |   | 17 Dec 1800 |
| OWINGS | Betsy | DOWNEY | John | Allison | 9 Nov 1800 |
| OWINGS | Elizabeth | WALKER | Cornelius |   | 30 Oct 1802 |
| OWINGS | Ellen | STONE | Henry | Welsh | 23 Feb 1808 |
| OWINGS | Francis | MOALE | Robert North | (illegible) | 1 July 1801 |
| OWINGS | Hannah | MILLION | Patrick | Ireland | 8 May 1800 |
| OWINGS | Hannah | BALLARD | William |   | 24 May 1813 |
| OWINGS | Mary | CROMWELL | Richard |   | 5 Feb 1800 |
| OWINGS | Mary | ROCHE | Alexander | Moranville | 27 Aug 1808 |
| OWINGS | Matilda | DOWNEY | Edmund |   | 13 Sept 1809 |
| OWINGS | Nancy | WINCHESTER | George | Armstong? | 11 May 1809 |
| OWINGS | Penelope D. | PRICE | Frederick | Glendy | 18 Mar 1809 |
| OWINGS | Phebe | POWELL | Howell |   | 19 Sept 1804 |
| OWINGS | Polly | PARKER | Thomas |   | 21 Sept 1802 |
| OWINGS | Rachel | SELLMAN | Vachel | Butler | 4 May 1804 |
| OWINGS | Rachel | DORSEY | Humphrey |   | 31 Oct 1816 |
| OWINGS | Ruth | SHEETZ | Joseph |   | 25 Nov 1801 |
| OWINGS | Sarah | TOY | Joseph | Roberts | 26 Feb 1811 |
| OWINGS | Susanna | SOLLERS | Bazel | Coleman | 25 Mar 1800 |
| OWINGS | Tabitha | MACABEE | Thomas | Hoskyns | 2 June 1813 |
| OYSTON | Ann | STONE | Walter |   | 9 Mar 1805 |
| OYSTON | Eizabeth | RAINES | John | Richards | 26 Mar 1808 |
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