Tip: To quickly navigate to a surname board, enter the surname in the "Find a Board" search above.
| Board | Threads | Messages | Last Post |
| Opdahl | 12 | 30 | 14 Jun 2014 |
| Opdenaker | 5 | 22 | 11 Aug 2011 |
| Opdengraeff | 8 | 25 | 26 Jun 2015 |
| Opdenhoff | 0 | 0 | |
| Opdenkelder | 2 | 5 | 24 Nov 2010 |
| Opdyck | 13 | 20 | 4 Oct 2013 |
| Opdyke | 52 | 156 | 21 May 2014 |