| State Routes in Washington | |
|---|---|
   Highway markers for State Route 4, State Route 27, and State Route 520 | |
 The state highway system of Washington | |
| System information | |
| Length | 7,054.96 mi[1] (11,353.86 km) |
| Formed | 1964 |
| Notes | Maintained byWSDOT |
| Highway names | |
| Interstates | Interstate X (I-X) |
| US Highways | U.S. Route X (US X) |
| State | State Route nn (SR nn) |
| Spur Routes: | State Route nn Spur (SR nn Spur) |
| System links | |
TheU.S. state ofWashington has over 7,000 miles (11,000 km) ofstate highways maintained by theWashington State Department of Transportation (WSDOT).[1] The highway system is defined through acts by thestate legislature and is encoded in theRevised Code of Washington as State Routes (SR). It was created in1964 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 onSR 165.
The state'sInterstate andU.S. Highways are also defined as part of the state route system, but are omitted from this list.
| Number | Length (mi)[1] | Length (km) | Southern or western terminus | Northern or eastern terminus | Formed[2] | Removed | Notes | |
|---|---|---|---|---|---|---|---|---|
 SR 3 | 59.81 | 96.25 | US 101 inShelton | SR 104 nearPort Gamble | 01964-01-011964 | current | ||
 SR 4 | 62.27 | 100.21 | US 101 atJohnston's Landing | I-5 inKelso | 01964-01-011964 | current | ||
 SR 6 | 51.37 | 82.67 | US 101 inRaymond | I-5 inChehalis | 01964-01-011964 | current | ||
 SR 7 | 58.26 | 93.76 | US 12 inMorton | I-5/I-705 inTacoma | 01964-01-011964 | current | ||
 SR 8 | 20.67 | 33.27 | US 12 inElma | US 101 nearOlympia | 01967-01-011967 | current | ||
| SR 8 | — | — | US 410 inElma | I-5 atGrand Mound | 01964-01-011964 | 01967-01-011967 | Replaced byUS 12, number re-assigned to former US 410 | |
 SR 9 | 97.35 | 156.67 | SR 522 nearWoodinville | BC 11 inSumas | 01964-01-011964 | current | ||
 SR 10 | 16.16 | 26.01 | SR 970 inTeanaway | US 97 nearEllensburg | 01970-01-011970 | current | ||
 SR 11 | 21.30 | 34.28 | I-5 inBurlington | I-5 inBellingham | 01964-01-011964 | current | ||
 SR 12 | — | — | US 97/US 830 nearMaryhill | US 410 nearKennewick | 01964-01-011964 | 01967-01-011967 | Replaced bySR 14, number reassigned toUS 12 | |
 SR 14 | 180.66 | 290.74 | I-5 inVancouver | I-82/US 395 nearPlymouth | 01968-01-011968 | current | ||
| SR 14 | — | — | I-5 nearNapavine | US 410 inNaches | 01964-01-011964 | 01967-01-011967 | Replaced byUS 12 | |
 SR 16 | 27.16 | 43.71 | SR 3 inGorst | I-5 inTacoma | 01964-01-011964 | current | Signed east–west | |
 SR 17 | 136.67 | 219.95 | US 395 inMesa | US 97 nearBrewster | 01964-01-011964 | current | ||
 SR 18 | 28.41 | 45.72 | SR 99 inFederal Way | I-90 nearNorth Bend | 01964-01-011964 | current | ||
 SR 19 | 14.09 | 22.68 | SR 104 nearPort Ludlow | SR 20 nearPort Townsend | 01992-01-011992 | current | ||
 SR 20 | 436.13 | 701.88 | US 101 atDiscovery Bay | US 2 inNewport | 01964-01-011964 | current | Longest state highway in Washington | |
 SR 21 | 191.29 | 307.85 | SR 260 inKahlotus | BC Hwy 41 atCanada–US border inDanville | 01964-01-011964 | current | ||
 SR 22 | 35.84 | 57.68 | I-82/US 12 nearZillah | I-82/US 12 inProsser | 01964-01-011964 | current | ||
 SR 23 | 66.00 | 106.22 | US 195 nearSteptoe | SR 28 inHarrington | 01964-01-011964 | current | ||
 SR 24 | 79.23 | 127.51 | I-82/US 12/US 97 inYakima | SR 26 inOthello | 01964-01-011964 | current | ||
 SR 25 | 121.17 | 195.00 | US 2 inDavenport | BC Hwy 22 atCanada–US border | 01964-01-011964 | current | ||
 SR 26 | 133.61 | 215.02 | I-90 nearVantage | US 195 inColfax | 01964-01-011964 | current | ||
 SR 27 | 90.00 | 144.84 | US 195 nearPullman | SR 290 inSpokane Valley | 01964-01-011964 | current | ||
 SR 28 | 135.25 | 217.66 | US 2/US 97 inEast Wenatchee | US 2 inDavenport | 01964-01-011964 | current | ||
 SR 30 | — | — | US 97 inTonasket | US 395 nearKettle Falls | 01964-01-011964 | 01973-01-011973[3] | Replaced bySR 20 | |
 SR 31 | 26.79 | 43.11 | SR 20 inTiger | BC Hwy 6 atCanada–US border | 01964-01-011964 | current | ||
 SR 35 | — | — | OR 35 atHood River | SR 14 inWhite Salmon | proposed | — | ||
 SR 41 | 0.41 | 0.66 | ID 41 inOldtown | US 2 inNewport | 01997-01-011997 | current | ||
 SR 92 | 9.16 | 14.74 | SR 9 inLake Stevens | Mountain Loop Highway inGranite Falls | 01964-01-011964 | current | ||
 SR 96 | 6.75 | 10.86 | I-5 inEverett | SR 9 nearCathcart | 01992-01-011992 | current | ||
 SR 99 | 49.13 | 79.07 | I-5 inFife | I-5/SR 526/SR 527 inEverett | 01964-01-011964 | current | ||
 SR 100 | 4.68 | 7.53 | US 101 inIlwaco | SR 100 inIlwaco | 01992-01-011992 | current | ||
 SR 102 | 2.86 | 4.60 | Washington Corrections Center | US 101 nearShelton | 01984-01-011984 | current | ||
 SR 103 | 19.97 | 32.14 | US 101 inSeaview | Leadbetter Point State Park | 01964-01-011964 | current | ||
 SR 104 | 31.75 | 51.10 | US 101 nearDiscovery Bay | SR 522 inLake Forest Park | 01964-01-011964 | current | ||
 SR 105 | 48.57 | 78.17 | US 101 inRaymond | US 101 inAberdeen | 01964-01-011964 | current | ||
 SR 106 | 20.09 | 32.33 | US 101 inSkokomish | SR 3 nearBelfair | 01964-01-011964 | current | ||
 SR 107 | 7.93 | 12.76 | US 101 nearCosmopolis | US 12 inMontesano | 01964-01-011964 | current | ||
 SR 108 | 11.96 | 19.25 | SR 8 inMcCleary | US 101 inKamilche | 01964-01-011964 | current | ||
 SR 109 | 40.50 | 65.18 | US 101 inHoquiam | Quinault Street inTaholah | 01964-01-011964 | current | ||
 SR 110 | 11.10 | 17.86 | Olympic National Park nearLa Push | US 101 inForks | 01992-01-011992 | current | ||
| SR 110 | — | — | SR 11 inBellingham | I-5 inBellingham | 01967-01-011967 | 01975-01-011975[3] | Replaced bySR 11 | |
 SR 111 | — | — | Hurricane Ridge inOlympic National Park | US 101 inPort Angeles | 01964-01-011964 | 01971-01-011971[3] | ||
 SR 112 | 61.31 | 98.67 | Makah Indian Reservation nearNeah Bay | US 101 nearPort Angeles | 01964-01-011964 | current | ||
 SR 113 | 9.98 | 16.06 | US 101 inSappho | SR 112 nearClallam Bay | 01992-01-011992 | current | ||
| SR 113 | — | — | US 101 atDiscovery Bay | SR 525 nearCoupeville | 01964-01-011964 | 01973-01-011973[3] | Replaced bySR 20 | |
 SR 115 | 2.28 | 3.67 | Point Brown Avenue inOcean Shores | SR 109 | 01973-01-011973 | current | ||
 SR 116 | 9.83 | 15.82 | SR 19 inIrondale | Fort Flagler State Park | 01992-01-011992 | current | ||
 SR 117 | 1.40 | 2.25 | US 101 inPort Angeles | Marine Drive inPort Angeles | 01992-01-011992 | current | ||
 SR 119 | 10.93 | 17.59 | US 101 inHoodsport | FH 24 nearLake Cushman | 01992-01-011992 | current | ||
 SR 120 | — | — | US 830 inWashougal | US 830 inPrindle | 01964-01-011964 | 01967-01-011967 | Replaced bySR 140 | |
 SR 121 | 7.67 | 12.34 | I-5 nearMaytown | I-5 nearTumwater | 01967-01-011967 | current | ||
| SR 121 | — | — | US 830 inBingen | FR 24 nearTrout Lake | 01964-01-011964 | 01967-01-011967 | Replaced bySR 141 | |
 SR 122 | 7.88 | 12.68 | US 12 inSilver Creek | US 12 inMossyrock | 01992-01-011992 | current | ||
| SR 122 | — | — | US 830 inLyle | US 97 inGoldendale | 01964-01-011964 | 01967-01-011967 | Replaced bySR 142 | |
 SR 123 | 16.36 | 26.33 | US 12 nearPackwood | SR 410 nearMount Rainier | 01967-01-011967 | current | ||
 SR 124 | 44.72 | 71.97 | US 12 inBurbank | US 12 inWaitsburg | 01964-01-011964 | current | ||
 SR 125 | 23.65 | 38.06 | OR 11 nearWalla Walla | SR 124 nearPrescott | 01964-01-011964 | current | ||
 SR 126 | — | — | US 12 nearDayton | US 12 nearPomeroy | 01964-01-011964 | 01992-01-011992[3] | ||
 SR 127 | 27.05 | 43.53 | US 12 nearPomeroy | SR 26 atDusty | 01970-01-011970 | current | ||
 SR 128 | 2.24 | 3.60 | US 12 inClarkston | ID 128 nearClarkston | 01964-01-011964 | current | ||
 SR 129 | 42.55 | 68.48 | OR 3 nearAnatone | US 12 inClarkston | 01964-01-011964 | current | ||
 SR 131 | 2.07 | 3.33 | FR 25 nearRandle | US 12 inRandle | 01992-01-011992 | current | ||
| SR 131 | — | — | US 10/US 97 nearEllensburg | US 97 nearVirden | 01964-01-011964 | 01975-01-011975[3] | Replaced byUS 97 | |
 SR 140 | — | — | SR 14 inWashougal | SR 14 inPrindle | 01968-01-011968 | 01992-01-011992[3] | ||
 SR 141 | 29.25 | 47.07 | SR 14 inBingen | FR 24 nearTrout Lake | 01968-01-011968 | current | ||
| SR 141 | — | — | SR 14 nearRiffe | SR 7 inMorton | 01964-01-011964 | 01967-01-011967 | ||
 SR 142 | 35.24 | 56.71 | SR 14 inLyle | US 97 inGoldendale | 01968-01-011968 | current | ||
 SR 143 | — | — | SR 14 nearPackwood | US 410 atCayuse Pass | 01964-01-011964 | 01967-01-011967 | Replaced bySR 123 | |
| SR 143 | — | — | SR 14 inPlymouth | Umatilla Bridge | 01973-01-011973 | 01985-01-011985[3] | Replaced byI-82 | |
 SR 150 | 11.76 | 18.93 | Wapato Point Parkway inManson | US 97 nearChelan Falls | 01964-01-011964 | current | ||
 SR 151 | — | — | US 2 inOrondo | US 97 nearChelan | 01964-01-011964 | 01987-01-011987[3] | Replaced byUS 97 | |
 SR 153 | 30.78 | 49.54 | US 97 nearPateros | SR 20 nearTwisp | 01964-01-011964 | current | ||
 SR 155 | 78.35 | 126.09 | US 2 nearCoulee City | US 97/SR 20 inOmak | 01964-01-011964 | current | ||
 SR 160 | 7.47 | 12.02 | SR 16 inPort Orchard | Fauntleroy ferry terminal inSeattle | 01964-01-011964 | current | ||
 SR 161 | 36.25 | 58.34 | SR 7 nearEatonville | SR 18 inFederal Way | 01964-01-011964 | current | ||
 SR 162 | 17.37 | 27.95 | SR 410 inSumner | SR 165 nearBuckley | 01964-01-011964 | current | ||
 SR 163 | 3.37 | 5.42 | SR 16 inTacoma | Tahlequah ferry terminal inVashon | 01991-01-011991 | current | ||
| SR 163 | — | — | US 410 inSumner | SR 167 inAuburn | 01964-01-011964 | 01969-01-011969 | Replaced bySR 167 | |
 SR 164 | 14.82 | 23.85 | SR 18 inAuburn | SR 410 inEnumclaw | 01969-01-011969 | current | ||
 SR 165 | 21.18 | 34.09 | Mowich Lake Road nearMowich Lake | SR 410 inBuckley | 01964-01-011964 | current | ||
 SR 166 | 5.13 | 8.26 | SR 16 nearPort Orchard | Whitter Avenue inPort Orchard | 01993-01-011993 | current | ||
 SR 167 | 28.60 | 46.03 | I-5 inTacoma | SR 900 inRenton | 01964-01-011964 | current | ||
 SR 168 | — | — | SR 410 nearGreenwater | SR 410 nearCliffdell | proposed | — | ||
 SR 169 | 25.26 | 40.65 | SR 164 inEnumclaw | SR 900 inRenton | 01964-01-011964 | current | ||
 SR 170 | 3.66 | 5.89 | SR 17 nearWarden | South Main Street inWarden | 01970-01-011970 | current | ||
| SR 170 | — | — | Ringold River Road nearBasin City | SR 17 nearMesa | 01965-01-011965 | 01967-01-011967 | ||
 SR 171 | 3.79 | 6.10 | I-90 inMoses Lake | SR 17 inMoses Lake | 01964-01-011964 | current | ||
 SR 172 | 35.01 | 56.34 | US 2 atFarmer | SR 17 nearMansfield | 01964-01-011964 | current | ||
 SR 173 | 11.86 | 19.09 | SR 17 inBridgeport | US 97 inBrewster | 01964-01-011964 | current | ||
 SR 174 | 40.66 | 65.44 | SR 17 in Leahy | SR 21 nearWilbur | 01964-01-011964 | current | ||
 SR 181 | 6.05 | 9.74 | SR 516 inKent | I-405 inTukwila | 01964-01-011964 | current | ||
 SR 193 | 2.58 | 4.15 | SR 128 nearClarkston | Wawawai Road nearClarkston | 01964-01-011964 | current | ||
 SR 194 | 21.01 | 33.81 | Almota Road inAlmota | US 195 nearPullman | 01991-01-011991 | current | ||
 SR 202 | 30.58 | 49.21 | SR 522 inWoodinville | I-90 inNorth Bend | 01970-01-011970 | current | ||
| SR 202 | — | — | SR 522 nearBothell | US 2 inMonroe | 01964-01-011964 | 01970-01-011970 | Replaced bySR 522 | |
 SR 203 | 24.26 | 39.04 | SR 202 inFall City | US 2 inMonroe | 01970-01-011970 | current | ||
 SR 204 | 2.38 | 3.83 | US 2 nearEverett | SR 9 inLake Stevens | 01964-01-011964 | current | ||
 SR 206 | 15.30 | 24.62 | US 2 nearMead | Mount Spokane State Park | 01964-01-011964 | current | ||
 SR 207 | 4.38 | 7.05 | US 2 atColes Corner | Lake Wenatchee State Park | 01964-01-011964 | current | ||
 SR 209 | — | — | US 2 nearLeavenworth | Lake Wenatchee State Park | 01964-01-011964 | 01992-01-011992[3] | ||
 SR 211 | 15.18 | 24.43 | US 2 nearDiamond Lake | SR 20 inUsk | 01975-01-011975 | current | ||
 SR 213 | 0.35 | 0.56 | US 97 nearMalott | First Avenue inMalott | 02008-01-012008 | current | ||
 SR 215 | 6.24 | 10.04 | SR 20 inOkanogan | US 97/SR 20 inOmak | 01973-01-011973 | current | ||
 SR 220 | 27.42 | 44.13 | Fort Simcoe State Park | SR 22 inToppenish | 01964-01-011964 | 01992-01-011992[3] | ||
 SR 221 | 25.95 | 41.76 | SR 14 inPaterson | SR 22 inProsser | 01964-01-011964 | current | ||
 SR 223 | 3.80 | 6.12 | SR 22 nearToppenish | I-82/US 12 inGranger | 01967-01-011967 | current | ||
 SR 224 | 10.15 | 16.33 | I-82/US 12 inBenton City | SR 240 inRichland | 01965-01-011965 | current | ||
 SR 225 | 11.33 | 18.23 | SR 224 inKiona | SR 240 atHorn Rapids Dam | 01991-01-011991 | current | ||
 SR 230 | — | — | I-90/US 395 inRitzville | SR 23 inEwan | proposed | — | ||
 SR 231 | 74.97 | 120.65 | SR 23 nearSprague | US 395 nearChewelah | 01964-01-011964 | current | ||
 SR 232 | — | — | SR 231 nearValley | US 395 nearValley | 01967-01-011967 | 01991-01-011991[3] | ||
 SR 237 | — | — | SR 20 inFredonia | SR 11 nearEdison | 01975-01-011975 | 01991-01-011991[3] | ||
 SR 240 | 41.31 | 66.48 | SR 24 nearHanford Reservation | US 395 inKennewick | 01964-01-011964 | current | ||
 SR 241 | 25.18 | 40.52 | SR 22 inMabton | SR 24 nearHanford Reservation | 01967-01-011967 | current | ||
 SR 243 | 28.23 | 45.43 | SR 24 nearDesert Aire | SR 26 nearVantage | 01964-01-011964 | current | ||
 SR 251 | — | — | SR 25 inNorthport | BC Hwy 22A at theCanada–US border | 01964-01-011964 | 01983-01-011983[3] | ||
 SR 260 | 37.98 | 61.12 | SR 17 nearConnell | SR 26/SR 261 inWashtucna | 01964-01-011964 | current | ||
 SR 261 | 62.71 | 100.92 | US 12 nearStarbuck | I-90/US 395 inRitzville | 01964-01-011964 | current | ||
 SR 262 | 24.22 | 38.98 | SR 26 nearOthello | SR 17 nearWarden | 01991-01-011991 | current | ||
 SR 263 | 9.24 | 14.87 | Port of Windust | SR 260 inKahlotus | 01991-01-011991 | current | ||
 SR 270 | 9.89 | 15.92 | US 195 inPullman | ID 8 nearMoscow | 01964-01-011964 | current | ||
 SR 271 | 8.48 | 13.65 | SR 27 nearOakesdale | US 195 inRosalia | 01964-01-011964 | current | ||
 SR 272 | 19.22 | 30.93 | US 195 inColfax | ID 6 nearPalouse | 01964-01-011964 | current | ||
 SR 274 | 1.92 | 3.09 | SR 27 inTekoa | ID 60 nearTekoa | 01964-01-011964 | current | ||
 SR 276 | — | — | US 195 nearPullman | SR 270 nearPullman | 01973-01-011973 | 02016-01-012016[3] | Never built | |
 SR 278 | 5.50 | 8.85 | SR 27 inRockford | ID 58 nearRockford | 01991-01-011991 | current | ||
 SR 281 | 10.55 | 16.98 | I-90 nearGeorge | SR 28 inQuincy | 01964-01-011964 | current | ||
 SR 282 | 4.92 | 7.92 | SR 28 inEphrata | SR 17 nearEphrata | 01964-01-011964 | current | ||
 SR 283 | 14.86 | 23.91 | SR 281 Spur nearGeorge | SR 28 nearEphrata | 01964-01-011964 | current | ||
 SR 285 | 5.04 | 8.11 | SR 28 inEast Wenatchee | US 2/US 97 inSunnyslope | 01977-01-011977 | current | ||
 SR 290 | 18.31 | 29.47 | I-90 inSpokane | ID 53 atState Line | 01964-01-011964 | current | ||
 SR 291 | 33.09 | 53.25 | US 2/US 395 inSpokane | SR 231 nearFord | 01964-01-011964 | current | ||
 SR 292 | 5.91 | 9.51 | SR 231 inSpringdale | US 395 inLoon Lake | 01964-01-011964 | current | ||
 SR 294 | — | — | US 395 inColville | SR 31 inTiger | 01964-01-011964 | 01973-01-011973[3] | Replaced bySR 20 | |
 SR 300 | 3.35 | 5.39 | Belfair State Park | SR 3 inBelfair | 01964-01-011964 | current | ||
 SR 302 | 16.87 | 27.15 | SR 3 inAllyn | SR 16 inGig Harbor | 01964-01-011964 | current | ||
 SR 303 | 9.27 | 14.92 | SR 304 inBremerton | SR 3 inSilverdale | 01964-01-011964 | current | ||
 SR 304 | 3.14 | 5.05 | SR 3 inNavy Yard City | Colman Dock ferry terminal inSeattle | 01964-01-011964 | current | Deleted between 1991 and 1994[3] | |
 SR 305 | 13.50 | 21.73 | Colman Dock ferry terminal inSeattle | SR 3 inPoulsbo | 01964-01-011964 | current | ||
 SR 306 | — | — | SR 303 inBremerton | Illahee State Park | 01964-01-011964 | 01993-01-011993[3] | ||
 SR 307 | 5.25 | 8.45 | SR 305 inPoulsbo | SR 104 nearKingston | 01991-01-011991 | current | ||
 SR 308 | 3.42 | 5.50 | SR 3 inBangor | Naval Undersea Warfare Center inKeyport | 01971-01-011971 | current | ||
 SR 310 | 1.84 | 2.96 | SR 3 inBremerton | SR 304 inBremerton | 01991-01-011991 | current | ||
 SR 311 | — | — | US 2 nearDiamond Lake | SR 20 inUsk | 01964-01-011964 | 01975-01-011975[3] | Replaced bySR 211 | |
 SR 339 | 9.8 | 15.8 | Vashon ferry terminal | Colman Dock ferry terminal inSeattle | 01994-01-011994 | current | Passenger-only ferry route | |
 SR 397 | 22.31 | 35.90 | I-82/US 395 nearFinley | I-182/US 12/US 395 inPasco | 01992-01-011992 | current | ||
 SR 401 | 12.13 | 19.52 | US 101 inMegler | SR 4 inNaselle | 01964-01-011964 | current | ||
 SR 402 | — | — | SR 4 inGrays River | SR 6 nearPe Ell | 01964-01-011964 | 01971-01-011971[3] | Never built proposal | |
 SR 403 | — | — | Altoona | SR 4 inRosburg | 01964-01-011964 | 01992-01-011992[3] | ||
 SR 407 | — | — | SR 4 inCathlamet | Elochoman State Forest | 01964-01-011964 | 01992-01-011992[3] | ||
 SR 409 | 3.84 | 6.18 | Wahkiakum County ferry terminal onPuget Island | SR 4 inCathlamet | 01964-01-011964 | current | ||
 SR 410 | 107.44 | 172.91 | SR 167 inSumner | US 12 inNaches | 01967-01-011967 | current | ||
 SR 411 | 13.48 | 21.69 | SR 432 inLongview | I-5/SR 504 inCastle Rock | 01964-01-011964 | current | ||
 SR 431 | — | — | SR 4 inKelso | I-5 inKelso | 01968-01-011968 | 01992-01-011992[3] | ||
 SR 432 | 10.32 | 16.61 | SR 4 inWest Longview | I-5 inKelso | 01968-01-011968 | current | ||
 SR 433 | 0.94 | 1.51 | Lewis and Clark Bridge | SR 432 inLongview | 01968-01-011968 | current | ||
 SR 500 | 22.64 | 36.44 | I-5 inVancouver | SR 14 inCamas | 01964-01-011964 | current | ||
 SR 501 | 12.70 | 20.44 | I-5 inVancouver | I-5 inRidgefield | 01964-01-011964 | current | Divided into two sections | |
 SR 502 | 6.12 | 9.85 | I-5 nearMount Vista | SR 503 inBattle Ground | 01964-01-011964 | current | ||
 SR 503 | 54.11 | 87.08 | SR 500 inOrchards | I-5 inWoodland | 01964-01-011964 | current | ||
 SR 504 | 51.76 | 83.30 | I-5/SR 411 inCastle Rock | Mount St. Helens National Volcanic Monument | 01964-01-011964 | current | ||
 SR 505 | 19.29 | 31.04 | Kerron Street inWinlock | SR 504 nearToutle | 01964-01-011964 | current | ||
 SR 506 | 11.53 | 18.56 | 2nd Street inRyderwood | I-5 nearToledo | 01964-01-011964 | current | ||
 SR 507 | 43.88 | 70.62 | I-5/US 12 inCentralia | SR 7 inSpanaway | 01964-01-011964 | current | ||
 SR 508 | 32.84 | 52.85 | I-5/US 12 inNapavine | SR 7 inMorton | 01964-01-011964 | current | ||
 SR 509 | 35.17 | 56.60 | I-705 inTacoma | SR 99 inSeattle | 01964-01-011964 | current | ||
 SR 510 | 13.10 | 21.08 | SR 507 inYelm | I-5 inLacey | 01964-01-011964 | current | ||
 SR 512 | 12.06 | 19.41 | I-5 inLakewood | SR 161/SR 167 inPuyallup | 01964-01-011964 | current | ||
 SR 513 | 3.35 | 5.39 | SR 520 inSeattle | Magnuson Park inSeattle | 01964-01-011964 | current | ||
 SR 514 | — | — | I-5 inFife | SR 161 inEdgewood | 01964-01-011964 | 01992-01-011992[3] | ||
 SR 515 | 7.86 | 12.65 | SR 516 inKent | SR 900 inRenton | 01964-01-011964 | current | ||
 SR 516 | 16.49 | 26.54 | SR 509 inDes Moines | SR 169 inMaple Valley | 01964-01-011964 | current | ||
 SR 518 | 3.42 | 5.50 | SR 509 inBurien | I-5/I-405 inTukwila | 01964-01-011964 | current | ||
 SR 519 | 1.14 | 1.83 | I-90 inSeattle | Colman Dock ferry terminal inSeattle | 01991-01-011991 | current | ||
 SR 520 | 12.82 | 20.63 | I-5 inSeattle | SR 202 inRedmond | 01964-01-011964 | current | ||
 SR 522 | 24.64 | 39.65 | I-5 inSeattle | US 2 inMonroe | 01964-01-011964 | current | ||
 SR 523 | 2.45 | 3.94 | SR 99 inSeattle/Shoreline | SR 522 inLake Forest Park/Shoreline | 01991-01-011991 | current | ||
 SR 524 | 14.68 | 23.63 | SR 104 inEdmonds | SR 522 inMaltby | 01964-01-011964 | current | ||
 SR 525 | 30.68 | 49.37 | I-5/I-405 inLynnwood | SR 20 nearCoupeville | 01964-01-011964 | current | ||
 SR 526 | 4.52 | 7.27 | SR 525 inMukilteo | I-5/SR 99/SR 527 inEverett | 01964-01-011964 | current | ||
 SR 527 | 9.29 | 14.95 | I-405 inBothell | I-5/SR 99/SR 526 inEverett | 01964-01-011964 | current | ||
 SR 528 | 3.46 | 5.57 | I-5 inMarysville | SR 9 inMarysville | 01964-01-011964 | current | ||
 SR 529 | 7.88 | 12.68 | I-5 inEverett | SR 528 inMarysville | 01971-01-011971 | current | ||
 SR 530 | 50.45 | 81.19 | I-5 nearArlington | SR 20 inRockport | 01964-01-011964 | current | ||
 SR 531 | 9.88 | 15.90 | Wenberg County Park nearLake Goodwin | SR 9 inArlington | 01991-01-011991 | current | ||
 SR 532 | 10.09 | 16.24 | Sunrise Boulevard onCamano Island | I-5 nearStanwood | 01964-01-011964 | current | ||
 SR 534 | 5.08 | 8.18 | I-5 inConway | SR 9 inLake McMurray | 01964-01-011964 | current | ||
 SR 536 | 5.38 | 8.66 | SR 20 nearMount Vernon | I-5 inMount Vernon | 01964-01-011964 | current | ||
 SR 537 | — | — | SR 536 inFredonia | SR 11 nearEdison | 01964-01-011964 | 01975-01-011975[3] | Replaced bySR 237 | |
 SR 538 | 3.61 | 5.81 | I-5 inMount Vernon | SR 9 nearBig Lake | 01964-01-011964 | current | ||
 SR 539 | 15.18 | 24.43 | I-5 inBellingham | BC Hwy 13 atCanada–US border nearLynden | 01964-01-011964 | current | ||
 SR 540 | — | — | Lummi Indian Reservation | I-5 inFerndale | 01964-01-011964 | 01984-01-011984[3] | ||
 SR 542 | 57.29 | 92.20 | I-5 inBellingham | Mount Baker Ski Area | 01964-01-011964 | current | ||
 SR 543 | 1.09 | 1.75 | I-5 inBlaine | BC Hwy 15 atCanada–US border inBlaine | 01964-01-011964 | current | ||
 SR 544 | 8.94 | 14.39 | SR 539 nearLynden | SR 9 inNooksack | 01964-01-011964 | current | ||
 SR 546 | 8.02 | 12.91 | SR 539 nearLynden | SR 9 nearSumas | 01964-01-011964 | current | ||
 SR 547 | 10.72 | 17.25 | SR 542 inKendall | SR 9 inSumas | 01984-01-011984 | current | ||
 SR 548 | 13.85 | 22.29 | I-5 nearFerndale | I-5 inBlaine | 01991-01-011991 | current | ||
 SR 599 | 1.75 | 2.82 | I-5 inTukwila | SR 99 inTukwila | 01971-01-011971 | current | ||
 SR 603 | — | — | I-5 nearWinlock | SR 6 nearChehalis | 01964-01-011964 | 01992-01-011992[3] | Replaced bySR 505 | |
 SR 702 | 9.32 | 15.00 | SR 507 inMcKenna | SR 7 nearEatonville | 01964-01-011964 | current | ||
 SR 704 | 0.63 | 1.01 | Spanaway Loop Road inSpanaway | SR 7 inSpanaway | 02002-01-012002 | current | ||
 SR 706 | 13.64 | 21.95 | SR 7 inElbe | Longmire inMount Rainier National Park | 01964-01-011964 | current | ||
 SR 801 | — | — | SR 8 inRochester | I-5 inMaytown | 01964-01-011964 | 01967-01-011967 | Replaced bySR 121 | |
 SR 821 | 25.21 | 40.57 | I-82/US 97 inSelah | I-82/US 97 nearEllensburg | 01973-01-011973 | current | ||
 SR 823 | 5.56 | 8.95 | I-82/US 97 inSelah | SR 821 inSelah | 01984-01-011984 | current | ||
 SR 831 | — | — | US 830 inKelso | I-5 inKelso | 01964-01-011964 | 01967-01-011967 | Replaced bySR 431 | |
 SR 832 | — | — | US 830 inWest Longview | I-5 inKelso | 01964-01-011964 | 01967-01-011967 | Replaced bySR 432 | |
 SR 833 | — | — | Lewis and Clark Bridge | SR 832 inLongview | 01964-01-011964 | 01967-01-011967 | Replaced bySR 433 | |
 SR 900 | 16.20 | 26.07 | I-5 inTukwila | I-90 inIssaquah | 01964-01-011964 | current | ||
 SR 901 | — | — | I-90 inIssaquah | SR 202 inRedmond | 01964-01-011964 | 01992-01-011992[3] | ||
 SR 902 | 12.36 | 19.89 | I-90/US 395 nearMedical Lake | I-90/US 395 nearMedical Lake | 01964-01-011964 | current | ||
 SR 903 | 10.06 | 16.19 | SR 970 nearCle Elum | Wenatchee National Forest nearLake Cle Elum | 01964-01-011964 | current | ||
 SR 904 | 16.96 | 27.29 | I-90/US 395 inTyler | I-90/US 395 inFour Lakes | 01964-01-011964 | current | ||
 SR 906 | 2.65 | 4.26 | I-90 atSnoqualmie Pass | I-90 inHyak | 01967-01-011967 | current | ||
 SR 908 | — | — | I-405 inKirkland | SR 202 inRedmond | 01971-01-011971 | 02010-01-012010[3] | ||
 SR 920 | — | — | SR 901 inRedmond | SR 202 inRedmond | 01975-01-011975 | 01985-01-011985[3] | Replaced bySR 520 | |
 SR 970 | 10.31 | 16.59 | I-90 inCle Elum | US 97 inVirden | 01975-01-011975 | current | ||
 SR 971 | 15.02 | 24.17 | US 97 Alt nearEntiat | US 97 Alt nearChelan | 01991-01-011991 | current | ||
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WSDOT does not maintainbusiness routes, which are instead created and signed by local jurisdictions.[4]
