| Robin Seunghyun O (Chicago, IL) | Stephen W Oberhoff (Houston, TX) | Charles F O'Brecht (Severna Park, MD) |
| Eugene Oak (Los Angeles, CA) | Steven L Oberholtzer (Ann Arbor, MI) | Edward D O'Brian (Portland, OR) |
| Robert JrG Oake (Allen, TX) | Daniel Frederick Oberklein (Hilton Head Island, SC) | David M O'Brian (Houston, TX) |
| Robert M Oakes (Wilmington, DE) | Daniel W Oberle (Sylvania, OH) | K Scott O'Brian (Harrisburg, PA) |
| Michael A Oakes (Washington, DC) | John C Oberlin (Los Altos Hills, CA) | Denis R O'Brien (Vancouver, BC) |
| Brian C Oakes (Wilmington, DE) | Phillip S Oberlin (Holland, OH) | Paul D O'Brien (Carthage, MO) |
| Gary P Oakeson (Sandy, UT) | Thomas C Obermark (Minneapolis, MN) | Maureen P O'Brien (Madison, NJ) |
| Brian W Oaks (Dallas, TX) | Christy M O'Berry (Chicago, IL) | Terence P O'Brien (Chicago, IL) |
| Jimmie R Oaks (Moline, IL) | Brian W Oberst (Minneapolis, MN) | Kevin A O'Brien (Charlotte, NC) |
| Kirsten M Oates (Edmonton, AB) | Keith R Obert (Monroe, CT) | David Giles O'Brien (Cambridge, MA) |
| Mark A Oathout (Houston, TX) | Todd J Obijeski (Atlanta, GA) | Elizabeth A O'Brien (Mansfield, MA) |
| John P O'Banion (Sacramento, CA) | Naomi Obinata (San Jose, CA) | Gayle B O'Brien (Worcester, MA) |
| Mary J Obee (Oklahoma City, OK) | Norman F Oblon (Alexandria, VA) | Grace Law O'Brien (Chicago, IL) |
| David G Oberdick (Pittsburgh, PA) | Michael A Oblon (Washington, DC) | Jonathan Paul O'Brien (Kalamazoo, MI) |
| Todd M Oberdick (Stamford, CT) | Tomas OBlonsky (Anaheim, CA) | Michelle E O'Brien (Washington, DC) |
| William P Oberhardt (Chicago, IL) | James G O'Boyle (Chevy Chase, MD) | Michael T O'Brien (Des Peres, MO) |
| Geoffrey L Oberhaus (Cincinnati, OH) | Greg J O'Bradovich (Atlanta, GA) | |
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