Black Guillemot has been seen by:
| Birder | Location | Town | County | Date |
|---|---|---|---|---|
| Dick & Marge Bradley | Block Island ferry | Pelagic | Offshore | 24-Feb-2021 |
| Carlos Pedro | Block Island Ferry | Pelagic | Offshore | 04-Feb-2021 |
| Don Heitzmann | Block Island Ferry | New Shoreham | Washington | 04-Feb-2021 |
| Sue Palmer | BI ferry | Pelagic | Offshore | 04-Feb-2021 |
| Jan St.Jean | Block Island ferry | Pelagic | Offshore | 04-Feb-2021 |
| Jess Bishop | Block Island Ferry | Pelagic | Offshore | 04-Feb-2021 |