King Eider has been seen by:
| Birder | Location | Town | County | Date |
|---|---|---|---|---|
| Cathy Gim | Napatree Point | Westerly | Washington | 19-May-2013 |
| Carlos Pedro | Napatree | Westerly | Washington | 17-May-2013 |
| Jen Scranton | Napatree Pt | Westerly | Washington | 17-May-2013 |
| Jan St.Jean | Napatree Point | Westerly | Washington | 17-May-2013 |
| Wayne Munns | Napatree Point | Westerly | Washington | 17-May-2013 |
| Barbara Sherman | Napatree | Westerly | Washington | 17-May-2013 |
| John Magill | Napatree Pt | Westerly | Washington | 16-May-2013 |