Feature Name | Class | Elev. meters | County | Latitude DMS | Longitude DMS |
| Lake Osoyoos State Park | Park | 280 | Okanogan | 48 56 59 N | 119 25 58 W |
| Lake Padden | Reservoir | 137 | Whatcom | 48 42 17 N | 122 27 47 W |
| Lake Padden Dam | Dam | 137 | Whatcom | 48 42 17 N | 122 27 47 W |
| Lake Padden Golf Course | Locale | 154 | Whatcom | 48 42 14 N | 122 26 35 W |
| Lake Park | Populated Place | 136 | King | 47 43 15 N | 122 14 50 W |
| Lake Pateros | Reservoir | 239 | Chelan | 47 56 51 N | 119 51 56 W |
| Lake Philippa | Lake | 1021 | King | 47 36 35 N | 121 37 11 W |
| Lake Phoebe | Lake | 1611 | Chelan | 47 36 01 N | 121 06 19 W |
| Lake Pleasant | Lake | 121 | Clallam | 48 03 54 N | 124 19 38 W |
| Lake Pleasant Boat Launch Ramp | Locale | 121 | Clallam | 48 04 01 N | 124 19 57 W |
| Lake Pleasant Recreation Area | Park | 122 | Clallam | 48 03 31 N | 124 20 15 W |
| Lake Pondilla | Lake | 11 | Island | 48 13 40 N | 122 46 02 W |
| Lake Pugsley | Lake | 1044 | King | 47 35 10 N | 121 23 58 W |
| Lake Quinault | Lake | 58 | Grays Harbor | 47 28 26 N | 123 52 05 W |
| Lake Rebecca | Lake | 1457 | Kittitas | 47 33 00 N | 121 13 17 W |
| Lake Reveille | Lake | 1537 | Whatcom | 48 53 50 N | 121 22 12 W |
| Lake Ridge | Ridge | 1268 | Asotin | 46 04 43 N | 117 25 08 W |
| Lake Ridge Junior High School | School | 182 | Pierce | 47 12 10 N | 122 11 25 W |
| Lake River | Stream | | Clark | 45 50 37 N | 122 46 50 W |
| Lake Roesiger | Lake | 184 | Snohomish | 47 59 07 N | 121 55 13 W |
| Lake Roesiger | Populated Place | 237 | Snohomish | 47 59 00 N | 121 55 45 W |
| Lake Roesiger Park | Park | 219 | Snohomish | 47 58 51 N | 121 54 48 W |
| Lake Roosevelt National Recreation Area | Park | 394 | Okanogan | 47 57 22 N | 118 58 50 W |
| Lake Roosevelt National Recreation Area Headquarters | Building | 397 | Okanogan | 47 58 11 N | 118 58 04 W |
| Lake Roosevelt Senior High School | School | 365 | Okanogan | 47 58 13 N | 118 58 21 W |
| Lake Rowena | Lake | 1515 | Kittitas | 47 33 24 N | 121 13 05 W |
| Lake Rowland | Lake | 89 | Snohomish | 48 08 22 N | 122 19 38 W |
| Lake Ruth | Lake | 2009 | Chelan | 47 34 27 N | 120 51 41 W |
| Lake Sacajawea | Lake | 4 | Cowlitz | 46 08 06 N | 122 57 07 W |
| Lake Sacajawea | Reservoir | 135 | Walla Walla | 46 14 58 N | 118 52 47 W |
| Lake Sacajawea Bar | Bar | 46 | Franklin | 46 24 47 N | 118 38 59 W |
| Lake Sacajawea Park | Park | 4 | Cowlitz | 46 08 04 N | 122 57 09 W |
| Lake Sahalee Tyee | Lake | 1439 | Skamania | 45 59 13 N | 121 47 50 W |
| Lake Saint Clair | Lake | 36 | Thurston | 47 00 10 N | 122 43 03 W |
| Lake Sally Ann | Lake | 1661 | Chelan | 47 57 40 N | 121 09 09 W |
| Lake Samish | Lake | 84 | Whatcom | 48 40 09 N | 122 23 35 W |
| Lake Sammamish | Lake | 9 | King | 47 35 59 N | 122 05 54 W |
| Lake Sammamish State Park | Park | 13 | King | 47 33 36 N | 122 03 36 W |
| Lake Saul | Lake | 98 | Pierce | 47 04 05 N | 122 30 52 W |
| Lake Sawyer | Lake | 1327 | King | 47 40 29 N | 121 13 28 W |
| Lake Sawyer | Reservoir | 156 | King | 47 20 09 N | 122 02 46 W |
| Lake Scanewa | Reservoir | 242 | Lewis | 46 27 59 N | 122 06 18 W |
| Lake School | School | 997 | Asotin | 46 12 50 N | 117 14 25 W |
| Lake Sebago | Lake | 1422 | Skamania | 45 58 54 N | 121 47 52 W |
| Lake Serene | Lake | 164 | Snohomish | 47 52 10 N | 122 17 08 W |
| Lake Serene | Lake | 770 | Snohomish | 47 46 55 N | 121 34 16 W |
| Lake Serene | Reservoir | 121 | Pierce | 46 58 17 N | 122 30 46 W |
| Lake Shannon | Reservoir | 148 | Skagit | 48 32 51 N | 121 44 28 W |
| Lake Shoecraft | Lake | 100 | Snohomish | 48 07 49 N | 122 18 13 W |
| Lake Shoecraft | Reservoir | 100 | Snohomish | 48 07 35 N | 122 18 23 W |
| Lake Shoecraft Outlet Dam | Dam | 100 | Snohomish | 48 07 35 N | 122 18 23 W |
| Lake Shore | Populated Place | 66 | Clark | 45 41 26 N | 122 41 27 W |
| Lake Shore Elementary School | School | 71 | Clark | 45 41 20 N | 122 41 33 W |
| Lake Simms | Lake | 1210 | Snohomish | 47 48 31 N | 121 24 04 W |
| Lake Sixteen | Lake | 480 | Whitman | 46 58 01 N | 117 54 52 W |
| Lake Spokane Elementary School | School | 558 | Spokane | 47 49 49 N | 117 35 58 W |
| Lake Standstill | Lake | 238 | Mason | 47 25 29 N | 123 12 59 W |
| Lake Stevens | Lake | 65 | Snohomish | 48 00 23 N | 122 05 06 W |
| Lake Stevens | Populated Place | 66 | Snohomish | 48 00 54 N | 122 03 49 W |
| Lake Stevens Senior High School | School | 122 | Snohomish | 48 01 41 N | 122 04 44 W |
| Lake Stickney | Lake | 1058 | Snohomish | 47 55 10 N | 121 38 05 W |
| Lake Stilwell | Lake | 1260 | Skagit | 48 35 37 N | 121 35 06 W |
| Lake Stuart | Lake | 1545 | Chelan | 47 29 48 N | 120 52 42 W |
| Lake Stuart Trail | Trail | 1502 | Chelan | 47 29 50 N | 120 52 04 W |
| Lake Sturtevant | Lake | 47 | King | 47 37 11 N | 122 10 48 W |
| Lake Success | Lake | 1285 | Mason | 47 34 09 N | 123 27 36 W |
| Lake Sundown | Lake | 1193 | Grays Harbor | 47 32 09 N | 123 30 36 W |
| Lake Susan Jane | Lake | 1550 | Chelan | 47 43 18 N | 121 03 44 W |
| Lake Sutherland | Lake | 161 | Clallam | 48 04 45 N | 123 42 35 W |
| Lake Sylvester | Lake | 1908 | Chelan | 47 38 02 N | 120 55 27 W |
| Lake Sylvia State Park | Park | 70 | Grays Harbor | 47 00 04 N | 123 35 21 W |
| Lake Tapps | Reservoir | 175 | Pierce | 47 14 29 N | 122 11 04 W |
| Lake Tapps County Park | Park | 167 | Pierce | 47 14 31 N | 122 10 04 W |
| Lake Tapps Dike Number 10 | Dam | 167 | Pierce | 47 14 23 N | 122 09 22 W |
| Lake Tapps Dike Number 11 | Dam | 167 | Pierce | 47 14 05 N | 122 08 52 W |
| Lake Tapps Dike Number 12 | Dam | 165 | Pierce | 47 13 47 N | 122 08 40 W |
| Lake Tapps Dike Number 13 | Dam | 169 | Pierce | 47 11 23 N | 122 09 52 W |
| Lake Tapps Dike Number 2A | Dam | 168 | Pierce | 47 14 59 N | 122 11 16 W |
| Lake Tapps Dike Number 2B | Dam | 166 | Pierce | 47 14 59 N | 122 11 10 W |
| Lake Tapps Dike Number Eight Dam | Dam | 166 | Pierce | 47 14 23 N | 122 09 40 W |
| Lake Tapps Dike Number Five Dam | Dam | 167 | Pierce | 47 14 23 N | 122 10 04 W |
| Lake Tapps Dike Number Four Dam | Dam | 160 | Pierce | 47 14 29 N | 122 10 16 W |
| Lake Tapps Dike Number Nine Dam | Dam | 166 | Pierce | 47 14 23 N | 122 09 34 W |
| Lake Tapps Dike Number One Dam | Dam | 175 | Pierce | 47 14 29 N | 122 11 04 W |
| Lake Tapps Dike Number Seven Dam | Dam | 166 | Pierce | 47 14 23 N | 122 09 46 W |
| Lake Tapps Dike Number Six Dam | Dam | 167 | Pierce | 47 14 17 N | 122 09 52 W |
| Lake Tapps Dike Number Three Dam | Dam | 131 | Pierce | 47 15 53 N | 122 10 40 W |
| Lake Tapps Elementary School | School | 178 | Pierce | 47 14 44 N | 122 11 35 W |
| Lake Tapps Elementary School | School | 177 | Pierce | 47 14 46 N | 122 11 36 W |
| Lake Terence | Lake | 1690 | Kittitas | 47 27 21 N | 121 05 24 W |
| Lake Terrell | Lake | 66 | Whatcom | 48 51 56 N | 122 41 22 W |
| Lake Terrell | Reservoir | 67 | Whatcom | 48 52 23 N | 122 41 23 W |
| Lake Terrell State Game Refuge | Park | 68 | Whatcom | 48 52 33 N | 122 41 21 W |
| Lake Thirty Two | Lake | 489 | Whitman | 47 00 16 N | 117 55 31 W |
| Lake Thirty-Two | Lake | 672 | Okanogan | 48 13 38 N | 119 35 32 W |
| Lake Thomas | Lake | 960 | Stevens | 48 37 38 N | 117 32 20 W |
| Lake Thomas Campground | Locale | 988 | Stevens | 48 37 26 N | 117 32 09 W |
| Lake Titicaca | Lake | 1183 | King | 47 43 33 N | 121 37 42 W |
| Lake Toke Tie | Lake | 1431 | Skamania | 45 59 30 N | 121 47 24 W |
| Lake Toketie | Lake | 1551 | Skagit | 48 19 55 N | 121 18 29 W |
| Lake Toketie | Lake | 1551 | Skagit | 48 19 55 N | 121 18 29 W |
| Lake Tom | Lake | 1370 | Pierce | 46 57 59 N | 121 52 27 W |
| Lake Trail | Trail | 1471 | Lewis | 46 43 41 N | 121 25 24 W |
| Lake Tupso | Lake | 1575 | Skagit | 48 24 09 N | 121 27 39 W |
| Lake Twentytwo | Lake | 737 | Snohomish | 48 03 51 N | 121 45 51 W |
| Lake Twentytwo Research Natural Area | Area | 765 | Snohomish | 48 04 12 N | 121 45 35 W |
| Lake Tyee | Lake | 279 | Skagit | 48 34 32 N | 121 45 55 W |
| Lake Umatilla | Reservoir | 82 | Klickitat | 45 43 03 N | 120 41 38 W |
| Lake Umtux | Lake | 1465 | Skamania | 45 59 28 N | 121 48 12 W |
| Lake Union | Lake | 5 | King | 47 38 21 N | 122 20 01 W |