Black Guillemot has been seen by:
| Birder | Location | Town | County | Date |
|---|---|---|---|---|
| Jan St.Jean | Block island ferry | New Shoreham | Washington | 25-Feb-2017 |
| Carlos Pedro | BI Ferry | New Shoreham | Washington | 25-Feb-2017 |
| Don Heitzmann | Block Island Ferry | New Shoreham | Washington | 25-Feb-2017 |
| Matt Schenck | Block Island Ferry | New Shoreham | Washington | 17-Feb-2017 |