|
| J-Line Creek (2) | Jack Creek (4) | Jackknife clam = Solen sicarius (4) |
| Jacksmelt = Atherinopsis californiensis (2) | jacksmelt = Atherinopsis californiensisbiological (1) | Jacksmelt=Atherinopsis californiensis (1) |
| Jackson Cr. (1) | Jackson Creek (21) | Jackson Creek (Netarts Bay) (1) |
| Jacob Creek (1) | Jacques Creek (1) | Janusion diminuta (Malmiana diminuta) (1) |
| Janusion virida (Malmiana virida) (1) | Japan (28) | Japanese eelgrass = Zostera japonica (23) |
| Japanese eelgrass=Zostera japonica (2) | Japanese littleneck=Tapes phillippinarum (7) | Japanese oyster drill = Ocenebra japonica (5) |
| Japanese oyster drill = Tritonalia japonica (4) | Japanese oyster drill=Ocenebra japonica (1) | Japanese seagrass = Zostera japonica (1) |
| Jasper Creek (1) | Jaybird Cree (1) | Jeeter Prairie (1) |
| jellyfish (1) | Jerden Cove (1) | Jerry Creek (1) |
| jetties (64) | Jim Creek (5) | Jimmy Creek (1) |
| Joe Hall Creek (1) | Joe Ney Slough (2) | John Creek (1) |
| John Day Formation (1) | John Day River (2) | John Newman Farm (1) |
| Johnson Creek (12) | Johnson Creek (Id.) (1) | Johnson Creek Landslide (1) |
| Johnson Rock Products (1) | Johnson Slough (3) | Johnson’s Slough (Yaquina) (1) |
| Jointing (1) | Jones Creek (2) | Jordan Cove (2) |
| Jordan Creek (1) | Jordan-Alder Creek (1) | Joyce Creek (3) |
| Joyce Creek (Smith River) (1) | Juan de Fuca (11) | Juan de Fuca plate (18) |
| Juan de Fuca Ridge (4) | Judd Creek (1) | Juga spp. (1) |
| Jump-Off Joe (15) | Jumpoff Joe (2) | Juncus balticus ssp. ater (2) |
| Jurassic (41) | juvenile fish (129) | juvenile fishes (2) |
| Juveniles (1) | | |
