# List of state routes in Washington

The U.S. state of Washington has over 7,000 miles (11,000 km) of state highways maintained by the Washington State Department of Transportation (WSDOT). The highway system is defined through acts by the state legislature and is encoded in the Revised Code of Washington as State Routes (SR). It was created in 1964 to replace an earlier numbering scheme and ratified by the state legislature in 1970. The system's 196 highways are almost entirely paved, with the exception of a gravel section on SR 165.
The state's Interstate and U.S. Highways are also defined as part of the state route system, but are omitted from this list.

## State routes

| Number | Length (mi) | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes |
| SR 3 | 59.81 | 96.25 | US 101 in Shelton | SR 104 near Port Gamble | 01964-01-011964 | current | |
| SR 4 | 62.27 | 100.21 | US 101 at Johnston's Landing | I-5 in Kelso | 01964-01-011964 | current | |
| SR 6 | 51.37 | 82.67 | US 101 in Raymond | I-5 in Chehalis | 01964-01-011964 | current | |
| SR 7 | 58.26 | 93.76 | US 12 in Morton | I-5/I-705 in Tacoma | 01964-01-011964 | current | |
| SR 8 | 20.67 | 33.27 | US 12 in Elma | US 101 near Olympia | 01967-01-011967 | current | |
| SR 8 | — | — | US 410 in Elma | I-5 at Grand Mound | 01964-01-011964 | 01967-01-011967 | Replaced by US 12, number re-assigned to former US 410 |
| SR 9 | 97.35 | 156.67 | SR 522 near Woodinville | BC 11 in Sumas | 01964-01-011964 | current | |
| SR 10 | 16.16 | 26.01 | SR 970 in Teanaway | US 97 near Ellensburg | 01970-01-011970 | current | |
| SR 11 | 21.30 | 34.28 | I-5 in Burlington | I-5 in Bellingham | 01964-01-011964 | current | |
| SR 12 | — | — | US 97/US 830 near Maryhill | US 410 near Kennewick | 01964-01-011964 | 01967-01-011967 | Replaced by SR 14, number reassigned to US 12 |
| SR 14 | 180.66 | 290.74 | I-5 in Vancouver | I-82/US 395 near Plymouth | 01968-01-011968 | current | |
| SR 14 | — | — | I-5 near Napavine | US 410 in Naches | 01964-01-011964 | 01967-01-011967 | Replaced by US 12 |
| SR 16 | 27.16 | 43.71 | SR 3 in Gorst | I-5 in Tacoma | 01964-01-011964 | current | Signed east–west |
| SR 17 | 136.67 | 219.95 | US 395 in Mesa | US 97 near Brewster | 01964-01-011964 | current | |
| SR 18 | 28.41 | 45.72 | SR 99 in Federal Way | I-90 near North Bend | 01964-01-011964 | current | |
| SR 19 | 14.09 | 22.68 | SR 104 near Port Ludlow | SR 20 near Port Townsend | 01992-01-011992 | current | |
| SR 20 | 436.13 | 701.88 | US 101 at Discovery Bay | US 2 in Newport | 01964-01-011964 | current | Longest state highway in Washington |
| SR 21 | 191.29 | 307.85 | SR 260 in Kahlotus | BC Hwy 41 at Canada–US border in Danville | 01964-01-011964 | current | |
| SR 22 | 35.84 | 57.68 | I-82/US 12 near Zillah | I-82/US 12 in Prosser | 01964-01-011964 | current | |
| SR 23 | 66.00 | 106.22 | US 195 near Steptoe | SR 28 in Harrington | 01964-01-011964 | current | |
| SR 24 | 79.23 | 127.51 | I-82/US 12/US 97 in Yakima | SR 26 in Othello | 01964-01-011964 | current | |
| SR 25 | 121.17 | 195.00 | US 2 in Davenport | BC Hwy 22 at Canada–US border | 01964-01-011964 | current | |
| SR 26 | 133.61 | 215.02 | I-90 near Vantage | US 195 in Colfax | 01964-01-011964 | current | |
| SR 27 | 90.00 | 144.84 | US 195 near Pullman | SR 290 in Spokane Valley | 01964-01-011964 | current | |
| SR 28 | 135.25 | 217.66 | US 2/US 97 in East Wenatchee | US 2 in Davenport | 01964-01-011964 | current | |
| SR 30 | — | — | US 97 in Tonasket | US 395 near Kettle Falls | 01964-01-011964 | 01973-01-011973 | Replaced by SR 20 |
| SR 31 | 26.79 | 43.11 | SR 20 in Tiger | BC Hwy 6 at Canada–US border | 01964-01-011964 | current | |
| SR 35 | — | — | OR 35 at Hood River | SR 14 in White Salmon | proposed | — | |
| SR 41 | 0.41 | 0.66 | ID 41 in Oldtown | US 2 in Newport | 01997-01-011997 | current | |
| SR 92 | 9.16 | 14.74 | SR 9 in Lake Stevens | Mountain Loop Highway in Granite Falls | 01964-01-011964 | current | |
| SR 96 | 6.75 | 10.86 | I-5 in Everett | SR 9 near Cathcart | 01992-01-011992 | current | |
| SR 99 | 49.13 | 79.07 | I-5 in Fife | I-5/SR 526/SR 527 in Everett | 01964-01-011964 | current | |
| SR 100 | 4.68 | 7.53 | US 101 in Ilwaco | SR 100 in Ilwaco | 01992-01-011992 | current | |
| SR 102 | 2.86 | 4.60 | Washington Corrections Center | US 101 near Shelton | 01984-01-011984 | current | |
| SR 103 | 19.97 | 32.14 | US 101 in Seaview | Leadbetter Point State Park | 01964-01-011964 | current | |
| SR 104 | 31.75 | 51.10 | US 101 near Discovery Bay | SR 522 in Lake Forest Park | 01964-01-011964 | current | |
| SR 105 | 48.57 | 78.17 | US 101 in Raymond | US 101 in Aberdeen | 01964-01-011964 | current | |
| SR 106 | 20.09 | 32.33 | US 101 in Skokomish | SR 3 near Belfair | 01964-01-011964 | current | |
| SR 107 | 7.93 | 12.76 | US 101 near Cosmopolis | US 12 in Montesano | 01964-01-011964 | current | |
| SR 108 | 11.96 | 19.25 | SR 8 in McCleary | US 101 in Kamilche | 01964-01-011964 | current | |
| SR 109 | 40.50 | 65.18 | US 101 in Hoquiam | Quinault Street in Taholah | 01964-01-011964 | current | |
| SR 110 | 11.10 | 17.86 | Olympic National Park near La Push | US 101 in Forks | 01992-01-011992 | current | |
| SR 110 | — | — | SR 11 in Bellingham | I-5 in Bellingham | 01967-01-011967 | 01975-01-011975 | Replaced by SR 11 |
| SR 111 | — | — | Hurricane Ridge in Olympic National Park | US 101 in Port Angeles | 01964-01-011964 | 01971-01-011971 | |
| SR 112 | 61.31 | 98.67 | Makah Indian Reservation near Neah Bay | US 101 near Port Angeles | 01964-01-011964 | current | |
| SR 113 | 9.98 | 16.06 | US 101 in Sappho | SR 112 near Clallam Bay | 01992-01-011992 | current | |
| SR 113 | — | — | US 101 at Discovery Bay | SR 525 near Coupeville | 01964-01-011964 | 01973-01-011973 | Replaced by SR 20 |
| SR 115 | 2.28 | 3.67 | Point Brown Avenue in Ocean Shores | SR 109 | 01973-01-011973 | current | |
| SR 116 | 9.83 | 15.82 | SR 19 in Irondale | Fort Flagler State Park | 01992-01-011992 | current | |
| SR 117 | 1.40 | 2.25 | US 101 in Port Angeles | Marine Drive in Port Angeles | 01992-01-011992 | current | |
| SR 119 | 10.93 | 17.59 | US 101 in Hoodsport | FH 24 near Lake Cushman | 01992-01-011992 | current | |
| SR 120 | — | — | US 830 in Washougal | US 830 in Prindle | 01964-01-011964 | 01967-01-011967 | Replaced by SR 140 |
| SR 121 | 7.67 | 12.34 | I-5 near Maytown | I-5 near Tumwater | 01967-01-011967 | current | |
| SR 121 | — | — | US 830 in Bingen | FR 24 near Trout Lake | 01964-01-011964 | 01967-01-011967 | Replaced by SR 141 |
| SR 122 | 7.88 | 12.68 | US 12 in Silver Creek | US 12 in Mossyrock | 01992-01-011992 | current | |
| SR 122 | — | — | US 830 in Lyle | US 97 in Goldendale | 01964-01-011964 | 01967-01-011967 | Replaced by SR 142 |
| SR 123 | 16.36 | 26.33 | US 12 near Packwood | SR 410 near Mount Rainier | 01967-01-011967 | current | |
| SR 124 | 44.72 | 71.97 | US 12 in Burbank | US 12 in Waitsburg | 01964-01-011964 | current | |
| SR 125 | 23.65 | 38.06 | OR 11 near Walla Walla | SR 124 near Prescott | 01964-01-011964 | current | |
| SR 126 | — | — | US 12 near Dayton | US 12 near Pomeroy | 01964-01-011964 | 01992-01-011992 | |
| SR 127 | 27.05 | 43.53 | US 12 near Pomeroy | SR 26 at Dusty | 01970-01-011970 | current | |
| SR 128 | 2.24 | 3.60 | US 12 in Clarkston | ID 128 near Clarkston | 01964-01-011964 | current | |
| SR 129 | 42.55 | 68.48 | OR 3 near Anatone | US 12 in Clarkston | 01964-01-011964 | current | |
| SR 131 | 2.07 | 3.33 | FR 25 near Randle | US 12 in Randle | 01992-01-011992 | current | |
| SR 131 | — | — | US 10/US 97 near Ellensburg | US 97 near Virden | 01964-01-011964 | 01975-01-011975 | Replaced by US 97 |
| SR 140 | — | — | SR 14 in Washougal | SR 14 in Prindle | 01968-01-011968 | 01992-01-011992 | |
| SR 141 | 29.25 | 47.07 | SR 14 in Bingen | FR 24 near Trout Lake | 01968-01-011968 | current | |
| SR 141 | — | — | SR 14 near Riffe | SR 7 in Morton | 01964-01-011964 | 01967-01-011967 | |
| SR 142 | 35.24 | 56.71 | SR 14 in Lyle | US 97 in Goldendale | 01968-01-011968 | current | |
| SR 143 | — | — | SR 14 near Packwood | US 410 at Cayuse Pass | 01964-01-011964 | 01967-01-011967 | Replaced by SR 123 |
| SR 143 | — | — | SR 14 in Plymouth | Umatilla Bridge | 01973-01-011973 | 01985-01-011985 | Replaced by I-82 |
| SR 150 | 11.76 | 18.93 | Wapato Point Parkway in Manson | US 97 near Chelan Falls | 01964-01-011964 | current | |
| SR 151 | — | — | US 2 in Orondo | US 97 near Chelan | 01964-01-011964 | 01987-01-011987 | Replaced by US 97 |
| SR 153 | 30.78 | 49.54 | US 97 near Pateros | SR 20 near Twisp | 01964-01-011964 | current | |
| SR 155 | 78.35 | 126.09 | US 2 near Coulee City | US 97/SR 20 in Omak | 01964-01-011964 | current | |
| SR 160 | 7.47 | 12.02 | SR 16 in Port Orchard | Fauntleroy ferry terminal in Seattle | 01964-01-011964 | current | |
| SR 161 | 36.25 | 58.34 | SR 7 near Eatonville | SR 18 in Federal Way | 01964-01-011964 | current | |
| SR 162 | 17.37 | 27.95 | SR 410 in Sumner | SR 165 near Buckley | 01964-01-011964 | current | |
| SR 163 | 3.37 | 5.42 | SR 16 in Tacoma | Tahlequah ferry terminal in Vashon | 01991-01-011991 | current | |
| SR 163 | — | — | US 410 in Sumner | SR 167 in Auburn | 01964-01-011964 | 01969-01-011969 | Replaced by SR 167 |
| SR 164 | 14.82 | 23.85 | SR 18 in Auburn | SR 410 in Enumclaw | 01969-01-011969 | current | |
| SR 165 | 21.18 | 34.09 | Mowich Lake Road near Mowich Lake | SR 410 in Buckley | 01964-01-011964 | current | |
| SR 166 | 5.13 | 8.26 | SR 16 near Port Orchard | Whitter Avenue in Port Orchard | 01993-01-011993 | current | |
| SR 167 | 28.60 | 46.03 | I-5 in Tacoma | SR 900 in Renton | 01964-01-011964 | current | |
| SR 168 | — | — | SR 410 near Greenwater | SR 410 near Cliffdell | proposed | — | |
| SR 169 | 25.26 | 40.65 | SR 164 in Enumclaw | SR 900 in Renton | 01964-01-011964 | current | |
| SR 170 | 3.66 | 5.89 | SR 17 near Warden | South Main Street in Warden | 01970-01-011970 | current | |
| SR 170 | — | — | Ringold River Road near Basin City | SR 17 near Mesa | 01965-01-011965 | 01967-01-011967 | |
| SR 171 | 3.79 | 6.10 | I-90 in Moses Lake | SR 17 in Moses Lake | 01964-01-011964 | current | |
| SR 172 | 35.01 | 56.34 | US 2 at Farmer | SR 17 near Mansfield | 01964-01-011964 | current | |
| SR 173 | 11.86 | 19.09 | SR 17 in Bridgeport | US 97 in Brewster | 01964-01-011964 | current | |
| SR 174 | 40.66 | 65.44 | SR 17 in Leahy | SR 21 near Wilbur | 01964-01-011964 | current | |
| SR 181 | 6.05 | 9.74 | SR 516 in Kent | I-405 in Tukwila | 01964-01-011964 | current | |
| SR 193 | 2.58 | 4.15 | SR 128 near Clarkston | Wawawai Road near Clarkston | 01964-01-011964 | current | |
| SR 194 | 21.01 | 33.81 | Almota Road in Almota | US 195 near Pullman | 01991-01-011991 | current | |
| SR 202 | 30.58 | 49.21 | SR 522 in Woodinville | I-90 in North Bend | 01970-01-011970 | current | |
| SR 202 | — | — | SR 522 near Bothell | US 2 in Monroe | 01964-01-011964 | 01970-01-011970 | Replaced by SR 522 |
| SR 203 | 24.26 | 39.04 | SR 202 in Fall City | US 2 in Monroe | 01970-01-011970 | current | |
| SR 204 | 2.38 | 3.83 | US 2 near Everett | SR 9 in Lake Stevens | 01964-01-011964 | current | |
| SR 206 | 15.30 | 24.62 | US 2 near Mead | Mount Spokane State Park | 01964-01-011964 | current | |
| SR 207 | 4.38 | 7.05 | US 2 at Coles Corner | Lake Wenatchee State Park | 01964-01-011964 | current | |
| SR 209 | — | — | US 2 near Leavenworth | Lake Wenatchee State Park | 01964-01-011964 | 01992-01-011992 | |
| SR 211 | 15.18 | 24.43 | US 2 near Diamond Lake | SR 20 in Usk | 01975-01-011975 | current | |
| SR 213 | 0.35 | 0.56 | US 97 near Malott | First Avenue in Malott | 02008-01-012008 | current | |
| SR 215 | 6.24 | 10.04 | SR 20 in Okanogan | US 97/SR 20 in Omak | 01973-01-011973 | current | |
| SR 220 | 27.42 | 44.13 | Fort Simcoe State Park | SR 22 in Toppenish | 01964-01-011964 | 01992-01-011992 | |
| SR 221 | 25.95 | 41.76 | SR 14 in Paterson | SR 22 in Prosser | 01964-01-011964 | current | |
| SR 223 | 3.80 | 6.12 | SR 22 near Toppenish | I-82/US 12 in Granger | 01967-01-011967 | current | |
| SR 224 | 10.15 | 16.33 | I-82/US 12 in Benton City | SR 240 in Richland | 01965-01-011965 | current | |
| SR 225 | 11.33 | 18.23 | SR 224 in Kiona | SR 240 at Horn Rapids Dam | 01991-01-011991 | current | |
| SR 230 | — | — | I-90/US 395 in Ritzville | SR 23 in Ewan | proposed | — | |
| SR 231 | 74.97 | 120.65 | SR 23 near Sprague | US 395 near Chewelah | 01964-01-011964 | current | |
| SR 232 | — | — | SR 231 near Valley | US 395 near Valley | 01967-01-011967 | 01991-01-011991 | |
| SR 237 | — | — | SR 20 in Fredonia | SR 11 near Edison | 01975-01-011975 | 01991-01-011991 | |
| SR 240 | 41.31 | 66.48 | SR 24 near Hanford Reservation | US 395 in Kennewick | 01964-01-011964 | current | |
| SR 241 | 25.18 | 40.52 | SR 22 in Mabton | SR 24 near Hanford Reservation | 01967-01-011967 | current | |
| SR 243 | 28.23 | 45.43 | SR 24 near Desert Aire | SR 26 near Vantage | 01964-01-011964 | current | |
| SR 251 | — | — | SR 25 in Northport | BC Hwy 22A at the Canada–US border | 01964-01-011964 | 01983-01-011983 | |
| SR 260 | 37.98 | 61.12 | SR 17 near Connell | SR 26/SR 261 in Washtucna | 01964-01-011964 | current | |
| SR 261 | 62.71 | 100.92 | US 12 near Starbuck | I-90/US 395 in Ritzville | 01964-01-011964 | current | |
| SR 262 | 24.22 | 38.98 | SR 26 near Othello | SR 17 near Warden | 01991-01-011991 | current | |
| SR 263 | 9.24 | 14.87 | Port of Windust | SR 260 in Kahlotus | 01991-01-011991 | current | |
| SR 270 | 9.89 | 15.92 | US 195 in Pullman | ID 8 near Moscow | 01964-01-011964 | current | |
| SR 271 | 8.48 | 13.65 | SR 27 near Oakesdale | US 195 in Rosalia | 01964-01-011964 | current | |
| SR 272 | 19.22 | 30.93 | US 195 in Colfax | ID 6 near Palouse | 01964-01-011964 | current | |
| SR 274 | 1.92 | 3.09 | SR 27 in Tekoa | ID 60 near Tekoa | 01964-01-011964 | current | |
| SR 276 | — | — | US 195 near Pullman | SR 270 near Pullman | 01973-01-011973 | 02016-01-012016 | Never built |
| SR 278 | 5.50 | 8.85 | SR 27 in Rockford | ID 58 near Rockford | 01991-01-011991 | current | |
| SR 281 | 10.55 | 16.98 | I-90 near George | SR 28 in Quincy | 01964-01-011964 | current | |
| SR 282 | 4.92 | 7.92 | SR 28 in Ephrata | SR 17 near Ephrata | 01964-01-011964 | current | |
| SR 283 | 14.86 | 23.91 | SR 281 Spur near George | SR 28 near Ephrata | 01964-01-011964 | current | |
| SR 285 | 5.04 | 8.11 | SR 28 in East Wenatchee | US 2/US 97 in Sunnyslope | 01977-01-011977 | current | |
| SR 290 | 18.31 | 29.47 | I-90 in Spokane | ID 53 at State Line | 01964-01-011964 | current | |
| SR 291 | 33.09 | 53.25 | US 2/US 395 in Spokane | SR 231 near Ford | 01964-01-011964 | current | |
| SR 292 | 5.91 | 9.51 | SR 231 in Springdale | US 395 in Loon Lake | 01964-01-011964 | current | |
| SR 294 | — | — | US 395 in Colville | SR 31 in Tiger | 01964-01-011964 | 01973-01-011973 | Replaced by SR 20 |
| SR 300 | 3.35 | 5.39 | Belfair State Park | SR 3 in Belfair | 01964-01-011964 | current | |
| SR 302 | 16.87 | 27.15 | SR 3 in Allyn | SR 16 in Gig Harbor | 01964-01-011964 | current | |
| SR 303 | 9.27 | 14.92 | SR 304 in Bremerton | SR 3 in Silverdale | 01964-01-011964 | current | |
| SR 304 | 3.14 | 5.05 | SR 3 in Navy Yard City | Colman Dock ferry terminal in Seattle | 01964-01-011964 | current | Deleted between 1991 and 1994 |
| SR 305 | 13.50 | 21.73 | Colman Dock ferry terminal in Seattle | SR 3 in Poulsbo | 01964-01-011964 | current | |
| SR 306 | — | — | SR 303 in Bremerton | Illahee State Park | 01964-01-011964 | 01993-01-011993 | |
| SR 307 | 5.25 | 8.45 | SR 305 in Poulsbo | SR 104 near Kingston | 01991-01-011991 | current | |
| SR 308 | 3.42 | 5.50 | SR 3 in Bangor | Naval Undersea Warfare Center in Keyport | 01971-01-011971 | current | |
| SR 310 | 1.84 | 2.96 | SR 3 in Bremerton | SR 304 in Bremerton | 01991-01-011991 | current | |
| SR 311 | — | — | US 2 near Diamond Lake | SR 20 in Usk | 01964-01-011964 | 01975-01-011975 | Replaced by SR 211 |
| SR 339 | 9.8 | 15.8 | Vashon ferry terminal | Colman Dock ferry terminal in Seattle | 01994-01-011994 | current | Passenger-only ferry route |
| SR 397 | 22.31 | 35.90 | I-82/US 395 near Finley | I-182/US 12/US 395 in Pasco | 01992-01-011992 | current | |
| SR 401 | 12.13 | 19.52 | US 101 in Megler | SR 4 in Naselle | 01964-01-011964 | current | |
| SR 402 | — | — | SR 4 in Grays River | SR 6 near Pe Ell | 01964-01-011964 | 01971-01-011971 | Never built proposal |
| SR 403 | — | — | Altoona | SR 4 in Rosburg | 01964-01-011964 | 01992-01-011992 | |
| SR 407 | — | — | SR 4 in Cathlamet | Elochoman State Forest | 01964-01-011964 | 01992-01-011992 | |
| SR 409 | 3.84 | 6.18 | Wahkiakum County ferry terminal on Puget Island | SR 4 in Cathlamet | 01964-01-011964 | current | |
| SR 410 | 107.44 | 172.91 | SR 167 in Sumner | US 12 in Naches | 01967-01-011967 | current | |
| SR 411 | 13.48 | 21.69 | SR 432 in Longview | I-5/SR 504 in Castle Rock | 01964-01-011964 | current | |
| SR 431 | — | — | SR 4 in Kelso | I-5 in Kelso | 01968-01-011968 | 01992-01-011992 | |
| SR 432 | 10.32 | 16.61 | SR 4 in West Longview | I-5 in Kelso | 01968-01-011968 | current | |
| SR 433 | 0.94 | 1.51 | Lewis and Clark Bridge | SR 432 in Longview | 01968-01-011968 | current | |
| SR 500 | 22.64 | 36.44 | I-5 in Vancouver | SR 14 in Camas | 01964-01-011964 | current | |
| SR 501 | 12.70 | 20.44 | I-5 in Vancouver | I-5 in Ridgefield | 01964-01-011964 | current | Divided into two sections |
| SR 502 | 6.12 | 9.85 | I-5 near Mount Vista | SR 503 in Battle Ground | 01964-01-011964 | current | |
| SR 503 | 54.11 | 87.08 | SR 500 in Orchards | I-5 in Woodland | 01964-01-011964 | current | |
| SR 504 | 51.76 | 83.30 | I-5/SR 411 in Castle Rock | Mount St. Helens National Volcanic Monument | 01964-01-011964 | current | |
| SR 505 | 19.29 | 31.04 | Kerron Street in Winlock | SR 504 near Toutle | 01964-01-011964 | current | |
| SR 506 | 11.53 | 18.56 | 2nd Street in Ryderwood | I-5 near Toledo | 01964-01-011964 | current | |
| SR 507 | 43.88 | 70.62 | I-5/US 12 in Centralia | SR 7 in Spanaway | 01964-01-011964 | current | |
| SR 508 | 32.84 | 52.85 | I-5/US 12 in Napavine | SR 7 in Morton | 01964-01-011964 | current | |
| SR 509 | 35.17 | 56.60 | I-705 in Tacoma | SR 99 in Seattle | 01964-01-011964 | current | |
| SR 510 | 13.10 | 21.08 | SR 507 in Yelm | I-5 in Lacey | 01964-01-011964 | current | |
| SR 512 | 12.06 | 19.41 | I-5 in Lakewood | SR 161/SR 167 in Puyallup | 01964-01-011964 | current | |
| SR 513 | 3.35 | 5.39 | SR 520 in Seattle | Magnuson Park in Seattle | 01964-01-011964 | current | |
| SR 514 | — | — | I-5 in Fife | SR 161 in Edgewood | 01964-01-011964 | 01992-01-011992 | |
| SR 515 | 7.86 | 12.65 | SR 516 in Kent | SR 900 in Renton | 01964-01-011964 | current | |
| SR 516 | 16.49 | 26.54 | SR 509 in Des Moines | SR 169 in Maple Valley | 01964-01-011964 | current | |
| SR 518 | 3.42 | 5.50 | SR 509 in Burien | I-5/I-405 in Tukwila | 01964-01-011964 | current | |
| SR 519 | 1.14 | 1.83 | I-90 in Seattle | Colman Dock ferry terminal in Seattle | 01991-01-011991 | current | |
| SR 520 | 12.82 | 20.63 | I-5 in Seattle | SR 202 in Redmond | 01964-01-011964 | current | |
| SR 522 | 24.64 | 39.65 | I-5 in Seattle | US 2 in Monroe | 01964-01-011964 | current | |
| SR 523 | 2.45 | 3.94 | SR 99 in Seattle/Shoreline | SR 522 in Lake Forest Park/Shoreline | 01991-01-011991 | current | |
| SR 524 | 14.68 | 23.63 | SR 104 in Edmonds | SR 522 in Maltby | 01964-01-011964 | current | |
| SR 525 | 30.68 | 49.37 | I-5/I-405 in Lynnwood | SR 20 near Coupeville | 01964-01-011964 | current | |
| SR 526 | 4.52 | 7.27 | SR 525 in Mukilteo | I-5/SR 99/SR 527 in Everett | 01964-01-011964 | current | |
| SR 527 | 9.29 | 14.95 | I-405 in Bothell | I-5/SR 99/SR 526 in Everett | 01964-01-011964 | current | |
| SR 528 | 3.46 | 5.57 | I-5 in Marysville | SR 9 in Marysville | 01964-01-011964 | current | |
| SR 529 | 7.88 | 12.68 | I-5 in Everett | SR 528 in Marysville | 01971-01-011971 | current | |
| SR 530 | 50.45 | 81.19 | I-5 near Arlington | SR 20 in Rockport | 01964-01-011964 | current | |
| SR 531 | 9.88 | 15.90 | Wenberg County Park near Lake Goodwin | SR 9 in Arlington | 01991-01-011991 | current | |
| SR 532 | 10.09 | 16.24 | Sunrise Boulevard on Camano Island | I-5 near Stanwood | 01964-01-011964 | current | |
| SR 534 | 5.08 | 8.18 | I-5 in Conway | SR 9 in Lake McMurray | 01964-01-011964 | current | |
| SR 536 | 5.38 | 8.66 | SR 20 near Mount Vernon | I-5 in Mount Vernon | 01964-01-011964 | current | |
| SR 537 | — | — | SR 536 in Fredonia | SR 11 near Edison | 01964-01-011964 | 01975-01-011975 | Replaced by SR 237 |
| SR 538 | 3.61 | 5.81 | I-5 in Mount Vernon | SR 9 near Big Lake | 01964-01-011964 | current | |
| SR 539 | 15.18 | 24.43 | I-5 in Bellingham | BC Hwy 13 at Canada–US border near Lynden | 01964-01-011964 | current | |
| SR 540 | — | — | Lummi Indian Reservation | I-5 in Ferndale | 01964-01-011964 | 01984-01-011984 | |
| SR 542 | 57.29 | 92.20 | I-5 in Bellingham | Mount Baker Ski Area | 01964-01-011964 | current | |
| SR 543 | 1.09 | 1.75 | I-5 in Blaine | BC Hwy 15 at Canada–US border in Blaine | 01964-01-011964 | current | |
| SR 544 | 8.94 | 14.39 | SR 539 near Lynden | SR 9 in Nooksack | 01964-01-011964 | current | |
| SR 546 | 8.02 | 12.91 | SR 539 near Lynden | SR 9 near Sumas | 01964-01-011964 | current | |
| SR 547 | 10.72 | 17.25 | SR 542 in Kendall | SR 9 in Sumas | 01984-01-011984 | current | |
| SR 548 | 13.85 | 22.29 | I-5 near Ferndale | I-5 in Blaine | 01991-01-011991 | current | |
| SR 599 | 1.75 | 2.82 | I-5 in Tukwila | SR 99 in Tukwila | 01971-01-011971 | current | |
| SR 603 | — | — | I-5 near Winlock | SR 6 near Chehalis | 01964-01-011964 | 01992-01-011992 | Replaced by SR 505 |
| SR 702 | 9.32 | 15.00 | SR 507 in McKenna | SR 7 near Eatonville | 01964-01-011964 | current | |
| SR 704 | 0.63 | 1.01 | Spanaway Loop Road in Spanaway | SR 7 in Spanaway | 02002-01-012002 | current | |
| SR 706 | 13.64 | 21.95 | SR 7 in Elbe | Longmire in Mount Rainier National Park | 01964-01-011964 | current | |
| SR 801 | — | — | SR 8 in Rochester | I-5 in Maytown | 01964-01-011964 | 01967-01-011967 | Replaced by SR 121 |
| SR 821 | 25.21 | 40.57 | I-82/US 97 in Selah | I-82/US 97 near Ellensburg | 01973-01-011973 | current | |
| SR 823 | 5.56 | 8.95 | I-82/US 97 in Selah | SR 821 in Selah | 01984-01-011984 | current | |
| SR 831 | — | — | US 830 in Kelso | I-5 in Kelso | 01964-01-011964 | 01967-01-011967 | Replaced by SR 431 |
| SR 832 | — | — | US 830 in West Longview | I-5 in Kelso | 01964-01-011964 | 01967-01-011967 | Replaced by SR 432 |
| SR 833 | — | — | Lewis and Clark Bridge | SR 832 in Longview | 01964-01-011964 | 01967-01-011967 | Replaced by SR 433 |
| SR 900 | 16.20 | 26.07 | I-5 in Tukwila | I-90 in Issaquah | 01964-01-011964 | current | |
| SR 901 | — | — | I-90 in Issaquah | SR 202 in Redmond | 01964-01-011964 | 01992-01-011992 | |
| SR 902 | 12.36 | 19.89 | I-90/US 395 near Medical Lake | I-90/US 395 near Medical Lake | 01964-01-011964 | current | |
| SR 903 | 10.06 | 16.19 | SR 970 near Cle Elum | Wenatchee National Forest near Lake Cle Elum | 01964-01-011964 | current | |
| SR 904 | 16.96 | 27.29 | I-90/US 395 in Tyler | I-90/US 395 in Four Lakes | 01964-01-011964 | current | |
| SR 906 | 2.65 | 4.26 | I-90 at Snoqualmie Pass | I-90 in Hyak | 01967-01-011967 | current | |
| SR 908 | — | — | I-405 in Kirkland | SR 202 in Redmond | 01971-01-011971 | 02010-01-012010 | |
| SR 920 | — | — | SR 901 in Redmond | SR 202 in Redmond | 01975-01-011975 | 01985-01-011985 | Replaced by SR 520 |
| SR 970 | 10.31 | 16.59 | I-90 in Cle Elum | US 97 in Virden | 01975-01-011975 | current | |
| SR 971 | 15.02 | 24.17 | US 97 Alt near Entiat | US 97 Alt near Chelan | 01991-01-011991 | current | |
| Former Proposed and unbuilt ||||||||

## Special routes

WSDOT does not maintain business routes, which are instead created and signed by local jurisdictions.
| Number | Length (mi) | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed | Removed | Notes |
| SR 9 Spur | 0.24 | 0.39 | SR 9 in Sumas | Canada–US border in Sumas | — | — | |
| SR 14 Spur | 0.39 | 0.63 | SR 14 in Maryhill | US 97 in Maryhill | — | — | |
| SR 14 Bus. | — | — | SR 14 in Camas | SR 14 near Washougal | — | — | |
| SR 16 Alt. | 0.68 | 1.09 | Serves Tacoma Narrows Bridge toll plaza | Serves Tacoma Narrows Bridge toll plaza | 02007-01-012007 | current | |
| SR 16 Spur | 0.39 | 0.63 | SR 16 in Gorst | SR 3 in Gorst | 01988-01-011988 | current | |
| SR 20 Spur | 7.78 | 12.52 | SR 20 near Anacortes | San Juan Islands ferry | — | — | |
| SR 20 Bus. | — | — | — | — | 01964-01-011964 | 01973-01-011973 | Replaced by SR 215 |
| SR 26 Spur | 0.07 | 0.11 | SR 26 in Colfax | US 195 in Colfax | — | — | |
| SR 28 Spur | 0.76 | 1.22 | SR 285 in East Wenatchee | SR 28 in East Wenatchee | — | — | |
| SR 92 Spur | 0.08 | 0.13 | SR 92 in Granite Falls | Granite Falls | — | — | |
| SR 100 Spur | 0.08 | 0.13 | SR 100 near Fort Canby | Cape Disappointment State Park | 01991-01-011991 | current | |
| SR 104 Spur | 0.34 | 0.55 | SR 99 in Edmonds/Shoreline | SR 104 in Edmonds/Shoreline | — | — | |
| SR 105 Spur | 0.15 | 0.24 | SR 105 in Aberdeen | US 101 in Aberdeen | — | — | |
| SR 105 Spur | 4.02 | 6.47 | SR 105 at Twin Harbors State Park | Westhaven Drive in Westport | — | — | |
| SR 108 Bus. | — | — | SR 108 near McCleary | SR 108 in McCleary | — | — | |
| SR 109 Spur | 1.82 | 2.93 | SR 109 in Hoquiam | US 101 in Hoquiam | — | — | |
| SR 110 Spur | 2.67 | 4.30 | Olympic National Park boundary near Mora | SR 110 near Mora | — | — | |
| SR 125 Spur | 0.73 | 1.17 | US 12 in Walla Walla | SR 125 in Walla Walla | — | — | |
| SR 129 Spur | 0.25 | 0.40 | SR 129 in Clarkston | US 12 in Clarkston | — | — | |
| SR 141 Spur | 2.16 | 3.48 | SR 14 in Underwood | SR 141 near White Salmon | — | — | |
| SR 151 Spur | — | — | SR 151 near Chelan | US 97 near Chelan | 01964-01-011964 | 01987-01-011987 | Replaced by US 97 |
| SR 155 Spur | 0.37 | 0.60 | SR 215 in Omak | SR 155 in Omak | — | — | |
| SR 174 Spur | 1.37 | 2.20 | SR 174 near Grand Coulee | Crown Point Vista at Steamboat Rock State Park | 01964-01-011964 | current | |
| SR 174 Spur | 0.09 | 0.14 | SR 17 in Leahy | SR 174 in Leahy | 02009-01-012009 | current | |
| SR 240 Bus. | — | — | I-182/US 12/SR 240 in Richland | SR 240 in Richland | — | — | |
| SR 281 Spur | 1.69 | 2.72 | I-90/SR 283 near George | SR 281 near George | — | — | |
| SR 302 Spur | 1.28 | 2.06 | SR 302 in Purdy | SR 16 near Purdy | — | — | |
| SR 503 Spur | 8.42 | 13.55 | SR 503 near Yale | Swift Reservoir in Skamania County | — | — | |
| SR 504 Spur | 0.87 | 1.40 | SR 504 near Kid Valley | Toutle River Sediment Retention Structure | — | — | |
| SR 510 Spur | 1.17 | 1.88 | SR 510 in Yelm | Cullens Road in Yelm | 02010-01-012010 | current | |
| SR 524 Spur | 0.70 | 1.13 | SR 104 in Edmonds | SR 524 in Edmonds | — | — | |
| SR 524 Spur | 0.50 | 0.80 | I-5 in Lynnwood | SR 524 in Lynnwood | — | — | |
| SR 525 Spur | 0.86 | 1.38 | SR 525 in Mukilteo | SR 526 in Mukilteo | 02001-01-012001 | current | |
| SR 529 Spur | 0.20 | 0.32 | SR 529 in Everett | I-5 in Everett | — | — | |
| SR 903 Spur | 0.33 | 0.53 | SR 903 in Cle Elum | SR 970 near Cle Elum | — | — | |
| SR 906 Spur | 0.43 | 0.69 | SR 906 in Hyak | WSDOT Maintenance Office in Hyak | — | — | |
| Former ||||||||