Wikipedia:WikiProject U.S. Roads/Indiana/Historical information from the 1920s

Most of the information here is from [1] and the maps on [2].

State Road 1, New Albany to MI
- Now State Road 311, U.S. Route 31, U.S. Route 50, State Road 11, U.S. Route 31, State Road 933
State Road 2, IL to OH
- Now U.S. Route 30
State Road 3, IL to OH
- Now U.S. Route 40
State Road 4, Sullivan to Bloomfield; Bedford to OH
- Now State Road 54; old US 50, State Road 235, State Road 135, U.S. Route 50
State Road 5, Vincennes to New Albany
- Now U.S. Route 150
State Road 6, Madison to Boswell
- Now U.S. Route 421, U.S. Route 52, State Road 352
State Road 7, IL to Fort Wayne
- Now U.S. Route 24
State Road 8, Remington to Gary
- Now U.S. Route 231, State Road 2, State Road 55, State Road 330, State Road 53
State Road 9, Linton to Brazil; Rockville to north of Turkey Run State Park
- Now State Road 59; county roads through Marshall
State Road 10, Evansville to Whiting
- Now U.S. Route 41, State Road 352, Adeway Road, State Road 55, U.S. Route 24, U.S. Route 41, county roads through Lowell, Calumet Avenue, U.S. Route 41
State Road 11, Greenfield to MI
- Now State Road 9
State Road 12, Bruceville to Indianapolis
- Now State Road 67
State Road 13, Lewisville to MI
- Now State Road 103, State Road 3, State Road 18, State Road 1, State Road 327, South Street, State Road 427, State Road 127
State Road 14, Cannelton or Tell City to St. Croix
- Now State Road 37
State Road 15, Indianapolis to Michigan City
- Now U.S. Route 421, State Road 29, U.S. Route 35
State Road 16, Mount Vernon to New Albany
- Now State Road 62, State Road 162, State Road 62
State Road 17, Ligonier to Ohio
- Now U.S. Route 6
State Road 18, Rockport to Jasper
- Now U.S. Route 231
State Road 19, West of Tipton to Alexandria
- Now State Road 28
State Road 20, Mount Vernon to Owensville
- Now State Road 69, State Road 68, State Road 65
State Road 21, Liberty to Fort Wayne
- Now U.S. Route 27
State Road 22, east of St. Croix to Indianapolis
- Now State Road 37
State Road 23, Fiat to north of Portland
- Now State Road 1, Walnut Corner Road
State Road 24, Palmyra to Vallonia
- Now State Road 135
State Road 25, Michigan City to OH
- Now U.S. Route 20, State Road 2, State Road 933, U.S. Route 20
State Road 26, Bloomington to Madison
- Now State Road 46, State Road 7
State Road 27, Marion to Goshen
- Now State Road 15, State Road 13, State Road 114, State Road 15
State Road 28, Winslow to Switz City
- Now State Road 61, State Road 57
State Road 29, Lafayette to south of Kokomo
- Now State Road 26
State Road 30, where?
State Road 31, Hillsdale to Indianapolis
- Now U.S. Route 36
State Road 32, Bloomington to Lafayette
- Now State Road 46, U.S. Route 231
State Road 33, IL to OH
- Now U.S. Route 136, State Road 32
State Road 34, Brookville to Cambridge City
- Now State Road 1
State Road 35, Kokomo to Roll
- Now U.S. Route 35, State Road 9, State Road 18
State Road 36, Greensburg to Dunreith
- Now State Road 3
State Road 37, Indianapolis to Muncie
- Now State Road 67, State Road 32
State Road 38, Jeffersonville to Hamburg
- Now U.S. Route 31
State Road 39, Indianapolis to OH
- Now U.S. Route 52
State Road 40, Princeton to West Baden Springs; Scottsburg to Aurora
- Now State Road 64, State Road 61, State Road 56; State Road 56, State Road 3, State Road 256, State Road 56
State Road 41, Shoals to Mitchell
- Now U.S. Route 50, State Road 60
State Road 42, Valparaiso to Rolling Prairie
- Now State Road 2
State Road 43, IL to MI
- Now U.S. Route 12
State Road 44, Lebanon to Monticello
- Now State Road 39
State Road 45, Montmorenci to Wolcott
- Now U.S. Route 231
State Road 46, Elkhart to Fort Wayne
- Now U.S. Route 33
State Road 47, Chrisney to Tell City or Cannelton
- Now State Road 70, State Road 66
State Road 48, Connersville to OH
- Now Dunlapsville Road, State Road 101, U.S. Route 27
State Road 49, where?
State Road 50, Demotte to Argos
- Now State Road 10
State Road 51, Elkhart to MI
- Now State Road 19
State Road 52, where?
State Road 53, Greensburg to Lawrenceburg
- Now State Road 46, State Road 101, State Road 48
State Road 54, Lyford to Covington
- Now State Road 163, State Road 63
State Road 55, Hebron to Valparaiso
- Now State Road 2