| Common Name | County | Date | Observer(s) | Number | Comments | Record Type |
| 1 Harlequin Darner [Gomphaeschna furcillata] | Washington | 2008-03-28 | E. Corey | 45 | SCRI - | Sight |
| 2 Harlequin Darner [Gomphaeschna furcillata] | Washington | 2008-04-19 | E. Corey | 15 | SCRI - Patrolling territories along path at Weyerhauser Tract | Sight |
| 3 Harlequin Darner [Gomphaeschna furcillata] | Washington | 2008-04-23 | E. Corey | 0 | SCRI - Observed at Weyerhauser Tract while setting minnow traps | Sight |
| 4 Harlequin Darner [Gomphaeschna furcillata] | Washington | 1991-04-18 | R. Duncan Cuyler | 1 | sex=MALE, city=Plymouth, directions=NE on Rt. 45, habitat=Roanoke River, addl_habitat=access area, source=INTERNATIONAL ODONATA RESEARCH INSTITUTE-FSCA | Collect |
| 5 Harlequin Darner [Gomphaeschna furcillata] | Washington | 1991-04-17 | R. Duncan Cuyler | 2 | Male=1 Female=1, city=Plymouth, directions=NE on Rt. 45, habitat=Roanoke River, addl_habitat=access area, source=INTERNATIONAL ODONATA RESEARCH INSTITUTE-FSCA | Collect |
| 6 Harlequin Darner [Gomphaeschna furcillata] | Washington | 1990-04-20 | R. Duncan Cuyler | 2 | Male=2, city=Plymouth, directions=NE on Rt. 45, habitat=Roanoke River, addl_habitat=access area, source=INTERNATIONAL ODONATA RESEARCH INSTITUTE-FSCA | Collect |
| 7 Harlequin Darner [Gomphaeschna furcillata] | Washington | 1993-04-25 | R. Duncan Cuyler | 3 | Male=3, city=Plymouth, directions=NE on Rt. 45, habitat=Conaby Creek, source=INTERNATIONAL ODONATA RESEARCH INSTITUTE-FSCA | Collect |
| 8 Harlequin Darner [Gomphaeschna furcillata] | Washington | 1991-04-18 | R. Duncan Cuyler | 1 | sex=MALE, city=Plymouth, directions=NE on Rt. 45, habitat=Conaby Creek, source=INTERNATIONAL ODONATA RESEARCH INSTITUTE-FSCA | Collect |
| 9 Harlequin Darner [Gomphaeschna furcillata] | Washington | 1991-04-17 | R. Duncan Cuyler | 4 | Male=1 Female=3, city=Plymouth, directions=NE on Rt. 45, habitat=Conaby Creek, source=INTERNATIONAL ODONATA RESEARCH INSTITUTE-FSCA | Collect |
| 10 Harlequin Darner [Gomphaeschna furcillata] | Washington | 1993-04-25 | R. Duncan Cuyler | 4 | Male=3 Female=1, city=Plymouth, directions=NE on Rt. 45, habitat=Roanoke River, source=INTERNATIONAL ODONATA RESEARCH INSTITUTE-FSCA | Collect |
| 11 Harlequin Darner [Gomphaeschna furcillata] | Washington | 1995-04-25 | R. Duncan Cuyler | 3 | Male=2 Female=1, city=Plymouth, directions=NE on Rt. 45, habitat=Conaby Creek, source=INTERNATIONAL ODONATA RESEARCH INSTITUTE-FSCA | Collect |
| 12 Harlequin Darner [Gomphaeschna furcillata] | Washington | 2018-04-15 | Nicki Cagle | 1 | Pettigrew State Park, Creswell; iNaturalist Record #10986200 | Photo |