List of state highways in South Dakota

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SD 20.svg SD 240.svg
Standard South Dakota state highway shields
System information
NotesSouth Dakota highways are generally state-maintained.
Highway names
InterstatesInterstate X (I-X)
US HighwaysU.S. Highway X (US X)
State(State) Highway X (SD X)
System links
  • South Dakota State Trunk Highway System

South Dakota's state highways were assigned in a numbering pattern that followed that of the U.S. Highways followed upon their inception. East–west highways carried even numbers and increased from North to South  – while north–south highways carried odd numbers and increased from east to west. This holds true only for two-digit highways. Three-digit highways follow the odd–even routing, but do not sequentially remain near a "parent" route as a spur or alternate route, instead being more independent of any parent two-digit route.

View of an actual South Dakota state highway sign. The signs enclose the route number within the state's shape on top of a green background.

State highways[edit]

Number Length (mi) Length (km) Southern or western terminus Northern or eastern terminus Formed Removed Notes
SD 8 180 290 Montana state line Mobridge 01935-01-011935 01968-01-01c. 1968 Absorbed by SD 20 when extended west across the Missouri River
SD 10 175.945 283.156 SD 1804 in Pollock MN 28 at the Minnesota state line southeast of Sisseton 01927-01-011927 current
SD 11 77.724 125.085 South Franklin Street / East Rose Street in Elk Point MN 269 at the Minnesota state line near Sherman 01926-01-011926 current Segment between SD 50 and SD 48 is currently not a portion of the highway
SD 12 325 523 Mound City Minnesota state line southeast of Sisseton 01926-01-011926 01927-01-011927 Redesignated as SD 10
SD 13 23.891 38.449 SD 34 east of Egan US 14 north of Elkton 01926-01-011926 current
SD 15 67.562 108.730 SD 28 west of Toronto CR 17 / CR 34 north of Summit 01926-01-011926 current
SD 15A 10.486 16.876 US 12 near Marvin SD 15 at Wilmot 01951-01-011951 01976-12-311976[1] Originally part of the SD 15 mainline; redesignated as SD 123
SD 15Y 12.167 19.581 US 12 in Big Stone City SD 15 near Hartford Beach State Park 01957-01-011957 01976-12-311976[1] Redesignated as SD 109
SD 16 White Butte Big Stone City 01926-01-011926 01927-01-011927 Designated as part of US 12
SD 17 1.006 1.619 SD 44 at Lennox 278th Street at Lennox 01926-01-011926 current
SD 18 200 320 Montana state line Mobridge 01926-01-011926 01935-01-01c. 1935 Redesignated as South Dakota Highway 8
SD 19 86.974 139.971 N-15 at the Nebraska state line south of Vermillion SD 34 southeast of Madison 01926-01-011926 current Designated as part of US 12
SD 19A 8.161 13.134 SD 19/SD 46 south of Centerville SD 19 west of Centerville 01950-01-011950 current Originally part of SD 19
SD 20 385.079 619.725 Montana state line near Camp Crook MN 40 at the Minnesota state line near Revillo 01930-01-011930 current Follows US 212, US 81 and I-29 between two segments
SD 20A 9.150 14.725 SD 15 / SD 20 near La Bolt CSAH 44 at the Minnesota state line 01975-07-011975 Redesignated as SD 158

SD 20 Spur
3.532 5.684 Akaska US 83 / SD 20 near Akaska 01976-12-311976[1] Redesignated as SD 144

SD 20 Spur
0.458 0.737 North Lake Drive near Watertown SD 20 near Watertown Listed as SD 20P
SD 21 9.470 15.240 SD 28 west of Lake Norden US 81 east of Hayti 01926-01-011926 current
SD 22 48.546 78.127 CR 181 in Hazel MN 68 at the Minnesota state line south of Gary 01926-01-011926 current

SD 22 Spur
3.064 4.931 SD 22 near Gary Main Avenue in Gary 01976-12-311976[1] Redesignated as SD 101
SD 23 01976-12-311976[1] Redesignated as SD 139
SD 24 148 238 Belle Fourche Faith 01926-01-011926 01960-01-011960 Eliminated by a westward extension of SD 34
SD 24A 27 43 Belle Fourche Black Hills 01940-01-011940 01948-01-011948
SD 25 194.524 313.056 SD 50 northwest of Tabor ND 18 at the North Dakota state line north of Claire City 01926-01-011926 current Gap in route designated as CR 9
SD 26 49.540 79.727 SD 47 north of Highmore US 281 south of Redfield 01935-01-011935 current
SD 27 Hutchinson 01926-01-011926 01935-01-011935 Redesignated as part of SD 35
SD 27 42.639 68.621 US 12 southeast of Andover ND 32 at the North Dakota state line northeast of Kidder 01975-07-011975[1] current Originally northern part of the path of SD 25
SD 28 105.937 170.489 US 281 west of Hitchcock MN 271 at the Minnesota state line near Astoria 01934-01-011934 current
SD 30 Wyoming border southwest of Lead Minnesota border near Elkton 01926-01-011926 01927-01-011927
SD 30 17.077 27.483 CR 6/CR 77 west of White MN 19 at the Minnesota state line northeast of Bushnell 01955-01-011955 current
SD 32 8.643 13.910 I-29 (via Exit 114) SD 13 in Flandreau
SD 34 419.010 674.331 WYO 24 at the Wyoming state line MN 30 at the Minnesota state line
SD 35 19 31 Near Tabor Near Emery 01935-01-011935 01976-12-311976[1]
SD 36 9.087 14.624 US 16A in Custer State Park SD 79 near Hermosa
SD 37 242 389 N-14 at the Nebraska state line ND 1 at the North Dakota state line
SD 37A 2.4 3.9 SD 37 south of Tripp US 18 north of Tripp Business loop of highway 37 in Tripp
SD 38 63.393 102.021 I-90 Business in Mitchell I-29 in Sioux Falls
SD 38A SD 38 near Sioux Falls SD 38 in Sioux Falls 01994-01-011994
SD 40 37.369 60.140 US 16A in Keystone BIA Highway 41 in Red Shirt
SD 40A 2.173 3.497 SD 40 at Interior Badlands National Park Interior entrance gate Redesignated as SD 377
SD 41 197 317 Ravinia North Dakota 01926-01-011926 01952-01-01c. 1952 Absorbed by US 281
SD 42 71.973 115.829 US 281 IA 9 at the Iowa state line near Larchwood Three segments
SD 43 1.131 1.820 N-11 at the Nebraska state line US 18 in Fairfax
SD 44 379.022 609.977 US 385 near Merritt I-29 near Worthing
SD 45 198 319 SD 44 / SD 50 in Platte ND 3 at the North Dakota state line near Ashley
SD 46 105.535 169.842 US 18 / US 281 in Pickstown IA 10 at the Iowa state line near Hawarden
SD 47 240.866 387.636 N-137 at the Nebraska state line North Dakota state line
SD 48 12.469 20.067 I-29 near Spink Iowa state line near Akron
SD 49 35.134 56.543 US 18 / US 183 in Colome SD 47
SD 50 212.421 341.858 SD 34 near Fort Thompson IA 3 at the Iowa state line near Richland
SD 52 28.567 45.974 SD 37 near Springfield US 81 / SD 50 in Yankton
SD 53 67.475 108.590 Nebraska state line near Clearfield I-90 / US 83 in Vivian Two segments
SD 54 16 26 Bonesteel Nebraska 01926-01-011926 01960-01-01c. 1960
SD 59 51 82 Nebraska Murdo 01927-01-011927 01935-01-01c. 1935 Replaced by US 183
SD 63 167.455 269.493 US 18 near Parmelee ND 6 at the North Dakota state line near McLaughlin Two segments
SD 65 70.485 113.435 US 212 near Dupree ND 31 near McIntosh
SD 71 34.535 55.579 N-2 / N-71 at the Nebraska state line near Ardmore US 18 Bypass in Hot Springs 01962-01-011962 current
SD 73 255.291 410.851 N-61 near Merriman ND 49 at the North Dakota state line near Thunder Hawk
SD 75 29.352 47.237 SD 20 near Bison ND 8 at the North Dakota state line near Hettinger
SD 79 213.7 343.9 US 18 / US 385 at Maverick Junction ND 22 at the North Dakota state line
SD 81 Redesignated as SD 87
SD 83 Redesignated as US 385
SD 85 Redesignated as SD 83
SD 87 37.894 60.984 US 385 near Pringle US 16 / US 385 near Hill City
SD 89 34.5 55.5 US 18 near Minnekahta SD 87 in Custer State Park
SD 100 I-29 south of Sioux Falls I-90 east of Sioux Falls 02020-01-012020 current Under construction
SD 101 7.312 11.768 SD 10 / SD 45 near Eureka Long Lake 01976-12-311976[1] Redesignated as SD 239
SD 101 3.064 4.931 SD 22 near Gary Main Avenue in Gary 01976-12-311976[1] current Formerly SD 22 Spur
SD 102 18.024 29.007 US 12 near Roscoe SD 47 near Hosmer 01976-12-311976[1] Redesignated as SD 253
SD 103 SD 46 near Beresford Iowa state line at Hudson 01994-01-011994
SD 105 25.010 40.250 US 12 near Java CR 55 at the North Dakota state line near Artas 01976-12-311976[1] Formerly SD 271
SD 105 7.4 11.9 I-29 at North Sioux City I-29 at Jefferson 01980-01-01c. 1980 01998-01-011998
SD 106 4.935 7.942 SD 25 near Claire City SD 127 near Hammer 01975-07-011975[1] current
SD 109 12.167 19.581 US 12 in Big Stone City SD 15 near Hartford Beach State Park 01975-07-011975[1] current Formerly SD 15Y
SD 115 40 64 US 18 near Canton I-29 near Dell Rapids 01980-01-011980 current
SD 116 Became SD 423
SD 123 10.486 16.876 US 12 near Marvin SD 15 at Wilmot 01975-07-011975[1] current Formerly SD 15A
SD 127 37.328 60.074 SD 10 in Sisseton ND 127 at the North Dakota state line 01980-01-011980 current
SD 130 7.111 11.444 US 12 / US 83 / SD 20 in Selby SD 271 in Java 01975-07-011975[1] current
SD 134 US 12 near Mina EdmundsBrown county line near Mina Lake 02009-01-012009
SD 136 SD 37 in Groton US 12 at Groton 01975-07-011975[1] 02004-01-012004
SD 139 US 212 near Watertown SD 50 near Watertown 01975-07-011975[1] 02010-01-012010 Formerly SD 23
SD 144 3.532 5.684 Akaska US 83 / SD 20 near Akaska 01975-07-011975[1] current Formerly SD 20 Spur
SD 147 Redesignated as SD 49
SD 153 2.369 3.813 SD 52 near Yankton SD 50 near Yankton
SD 158 9.150 14.725 SD 15 / SD 20 near La Bolt CSAH 44 at the Minnesota state line 01975-07-011975[1] current Formerly SD 20A
SD 168 6.931 11.154 US 85 near Belle Fourche SD 79 near Castle Rock
SD 203 0.957 1.540 SD 258 near Plankinton State Training School near Plankinton
SD 204 2.131 3.430 SD 1806 at Lake Oahe SD 1804 at Lake Oahe Travels over Oahe Dam
SD 214 Bad River Road near Wendte US 83 near Fort Pierre 01991-01-011991
SD 218 8.680 13.969 I-29 near Brookings SD 13 near Elkton Redesignated as SD 324
SD 224 7.962 12.814 Alpena SD 37 near Huron
SD 228 I-90 at Box Elder Near Box Elder 01975-07-011975[1] Former US 14/US 16
SD 230 I-90 BL at Rapid City Box Elder 01975-07-011975[1] 02006-01-012006 Former US 14/US 16
SD 231 7.040 11.330 I-90 near Black Hawk SD 44 at Rapid City
SD 232 SD 79 at Rapid City SD 445 at Rapid City 01975-07-011975[1] 01994-01-011994
SD 235 Redesignated as US 16 Truck
SD 236 Lake Herman State Park SD 34 near Madison 02006-01-012006
SD 238 SD 79 at Rapid City SD 44 at Rapid City 01975-07-011975[1] 02006-01-012006
SD 239 7.312 11.768 SD 10 / SD 45 near Eureka Long Lake 01975-07-011975[1] current Formerly SD 101
SD 240 40.033 64.427 I-90 / US 14 at Wall I-90 near Cottonwood Passes through Badlands National Park
SD 244 10.457 16.829 US 16 / US 385 near Hill City US 16A near Keystone 01975-07-011975[1] current Provides access to Mount Rushmore
SD 245 SD 34 / SD 50 near Fort Thompson SD 34 / SD 47 near Stephan 01985-01-011985
SD 247 23.023 37.052 US 12 at Roscoe SD 10 / SD 45 near Eureka 01975-07-011975[1] current
SD 248 117.108 188.467 SD 240 near Badlands National Park I-90 at Reliance Former US 16
SD 249 1.055 1.698 SD 47 at Fort Thompson SD 34 near Fort Thompson 01975-07-011975[1] current
SD 251 15.800 25.428 Nebraska state line near Gregory US 18 / SD 47 at Gregory
SD 253 18.024 29.007 US 12 near Roscoe SD 47 near Hosmer 01975-07-011975[1] current Formerly SD 102
SD 258 2.552 4.107 I-90 at Plankinton US 281 near Plankinton
SD 262 17.563 28.265 I-90 near Alexandria SD 42 at Bridgewater Former US 16
SD 264 SD 11 at Brandon Minnesota state line near Valley Springs 01999-01-011999 Former US 16
SD 271 25.010 40.250 US 12 near Java CR 55 at the North Dakota state line near Artas 01975-07-011975[1] current Formerly SD 105
SD 273 12.723 20.476 I-90 near Kennebec SD 1806 near Lower Brule 01975-07-011975[1] current
SD 296 3 4.8 TurnerLincoln near Centerville SD 17 near Centerville 01991-01-011991
SD 298 Black Hills Ordnance Depot at Igloo SD 471 near Igloo 01998-01-011998
SD 314 3.751 6.037 SD 50 near Yankton Yankton city limits
SD 324 8.680 13.969 I-29 near Brookings SD 13 near Elkton Former SD 218
SD 365 1.5 2.4 US 18 / SD 73 at Martin North of Martin 01995-01-011995 Former US 18/SD 73
SD 377 2.173 3.497 SD 44 at Interior Badlands National Park Interior entrance gate
SD 391 3.362 5.411 N-27 at the Nebraska state line near Denby US 18 near Denby
SD 407 1.786 2.874 N-87 at the Nebraska state line near Pine Ridge US 18 at Pine Ridge
SD 423 0.5 0.80 New Underwood I-90 near New Underwood 01998-01-011998
SD 435 SD 230 at Box Elder I-90 at Box Elder 01998-01-011998
SD 437 SD 238 at Rapid City I-90 at Rapid City 01975-07-011975[1] 01994-01-011994 Now part of US 16 Truck
SD 439 SD 79 at Rapid City I-90 BL at Rapid City 01975-07-011975[1] 01990-01-011990
SD 443 SD 44 at Rapid City SD 79 at Rapid City 01975-07-011975[1] 02005-01-012005
SD 445 2.372 3.817 I-90 BL at Rapid City I-90 near Rapid City 01975-07-011975[1] current
SD 471 21.981 35.375 SD 71 near Rumford US 18 at Edgemont
SD 473 3.168 5.098 US 14A / US 85 near Lead Stewart Slope Road near Trojan
SD 514 Redesignated as parts of SD 1804 and SD 1806; became all of SD 204
SD 1804 126.745 203.976 Shore of the Missouri River south of Geddes ND 1804 at the North Dakota state line northwest of Pollock 01975-07-011975[1] current Four segments
SD 1806 122.603 197.310 01975-07-011975[1] current

See also[edit]

References[edit]

  1. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak "Highway Division Makes Road Numbering Changes". Argus-Leader. Sioux Falls. March 20, 1975. p. 2. Retrieved March 18, 2020 – via Newspapers.com. open access