Black Guillemot has been seen by:
| Birder | Location | Town | County | Date |
|---|---|---|---|---|
| Matt Schenck | Block Island Ferry | New Shoreham | Washington | 18-Feb-2018 |
| Jan St.Jean | Block island ferry | Pelagic | Offshore | 18-Feb-2018 |
| Birder | Location | Town | County | Date |
|---|---|---|---|---|
| Matt Schenck | Block Island Ferry | New Shoreham | Washington | 18-Feb-2018 |
| Jan St.Jean | Block island ferry | Pelagic | Offshore | 18-Feb-2018 |