Black Guillemot has been seen by:
| Birder | Location | Town | County | Date |
|---|---|---|---|---|
| John Magill | Mansion Beach | New Shoreham | Washington | 14-Mar-2013 |
| Barbara Sherman | Mansion Beach | New Shoreham | Washington | 14-Mar-2013 |
| Jan St.Jean | Mansion Beach | New Shoreham | Washington | 14-Mar-2013 |