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All unnumbered highways received a number in 1953 (minutes p. 63). A partial 1923 map is at [1] and a full 1925 map is at [2].

SH-1
US-2
  • Washington Newport to Montana
  • 1959: same
  • ? Washington-Sandpoint, Kootenai Highway Bonners Ferry-Montana
SH-3
  • US-12 to I-90
  • 1959: US-95A to I-90; rest was SH-42, SH-7, SH-8, SH-43, US-95A
SH-4
  • I-90 Wallace to Burke
  • 1959: same
SH-5
  • US-95 Plummer to SH-3 Saint Maries
  • 1959: same
SH-6
  • Washington to SH-3 Santa
  • 1959: Washington to US-95 Potlatch; rest was US-95A
SH-7
  • Clearwater/Lewis County line to US-12 Orofino
  • 1959: US-95 Grangeville to US-95A Harvard; now N/A, SH-162, SH-62, N/A, SH-7, N/A, SH-3, SH-9
  • Grangeville-Harvard Highway
SH-8
  • Washington Moscow to Elk River
  • 1959: Washington Moscow to SH-43 Bovill; rest was SH-43
  • Deary-Bovill Road
SH-9
  • SH-8 Deary to SH-6 Harvard
  • 1959: N/A; was SH-7
Former SH-9
Former US-10
Former US-10A
SH-11
US-12
  • Washington Lewiston to Montana Lolo Pass
  • 1959: N/A; was US-410, US-95, SH-9
Former SH-12
SH-13
  • US-95 Grangeville to US-12 Kooskia
  • 1959: same
SH-14
I-15
  • Utah to Montana Monida Pass
  • 1959: N/A; was US-191, US-91
Former SH-15
SH-16
  • SH-44 Star to SH-52 Emmett
  • 1959: same
Former SH-17
Former SH-18
  • 1959: Oregon to US-95 Parma; now N/A
SH-19
  • Oregon to I-84B Caldwell
  • 1959: same
US-20
  • Oregon to Montana Targhee Pass
  • 1959: same; was SH-68, SH-23 Mountain Home to Carey (used current US-26)
Former US-20A
  • 1959: US-20 Sugar City to Wyoming; now SH-33
SH-21
SH-22
Former SH-23
SH-24
  • I-84 Heyburn to US-93 Shoshone
  • Lincoln-Minidoka County line to Minidoka removed in 1958 - reverted to state in 1959
  • 1959: same
SH-25
  • I-84 Jerome to I-84 Rupert
  • 1959: US-30 Bliss to US-30N Rupert; now I-84, SH-25
  • North Side Highway
US-26
  • Oregon to Wyoming Alpine
  • 1959: same
Former SH-26
  • US-93 to US-30 Twin Falls; now SH-74
SH-27
  • Oakley to SH-25 Paul
  • 1959: same
SH-28
  • SH-33 Terreton to US-93 Salmon
  • 1956 (minutes p. 38): US-91 to US-93 Salmon; now SH-33, SH-28
  • 1959: same
  • Lemhi Highway
SH-29
  • SH-28 Leadore to Montana Bannock Pass
  • 1959: same
Former SH-29
  • Until ca. 1951: US-20 Idaho Falls to Wyoming Alpine; now US-26
US-30
  • Oregon Fruitland to Wyoming Border
  • 1959: Oregon Fruitland to US-30N/US-30S Heyburn; rest was US-30N
  • Old Oregon Trail Highway
Former US-30N
  • 1959: Oregon Weiser to US-30 Fruitland; now US-95 Spur
  • 1959: US-30/US-30S Heyburn to Wyoming Border; now US-30
  • Old Oregon Trail Highway
Former US-30S
  • 1959: US-30/US-30N Heyburn to Utah Strevell; now SH-81, N/A
SH-31
  • US-26 Swan Valley to SH-33 Victor
  • 1959: same
SH-32
SH-33
  • US-20/US-26 Arco to Wyoming
  • 1959: US-20 Sugar City to Wyoming (also overlapped by US-20A); rest was SH-22, SH-88
SH-34
  • US-91 Preston to Wyoming Freedom
  • Until 1951: US-91 Preston to Wyoming Freedom; now SH-34
  • 1959: Utah to Wyoming Freedom; now N/A, SH-34
  • Preston-Fairview Highway (1951)
Former SH-35
SH-36
  • I-15 Malad to US-89 Paris
  • 1959: N/A; was N/A, SH-35, SH-86, N/A
Former SH-36
  • 1959: ???
SH-37
  • Oneida/Power County line to I-86 American Falls
  • 1959: US-191 Malad to US-30N American Falls; now SH-38, N/A, SH-37
SH-38
  • I-15 Malad to Holbrook
  • 1959: N/A; was SH-37
Former SH-38
  • Until 1955: SH-37 Holbrook to US-30N Pocatello
  • 1959: SH-37 Holbrook to Power/Bannock County line; now N/A
SH-39
  • American Falls to US-26 Blackfoot
  • 1959: same
SH-40
  • I-15 to US-91 Downey
  • 1959: N/A; was N/A
Former SH-40
  • 1959: ???
SH-41
  • I-90 Post Falls to US-2 Newport
  • 1959: same
Former SH-42
  • 1959: US-95 Spalding to SH-7 Kendrick; now SH-3
SH-43
  • US-26 Beeches Corner to US-20 Ucon
  • 1959: N/A; was N/A
Former SH-43
  • 1959: Elk River to US-95A Santa; now SH-8, SH-3
SH-44
SH-45
  • SH-78 to I-84B Nampa
  • 1959: Murphy to US-30 Nampa; now SH-78, SH-45
SH-46
SH-47
  • US-20 Ashton to Bear Gulch in Targhee National Forest
  • Created in 1957 from old US-20/US-191; removed in 1957 and restored in 1958??
  • 1959: same
Former SH-47
  • Until 1951 (or 1957??): Rock Creek Road, US-20 Ashton to Wyoming
  • 1956 (minutes p. 39): US-20 Ashton to Wyoming
SH-48
  • I-15 Roberts to US-26B Ririe
  • 1959: same
Former SH-49
  • Until 1957: US-191 Idaho Falls to SH-48 Menan
  • 1959: north of Idaho Falls to SH-48 Menan; now N/A
SH-50
  • US-30 Twin Falls to SH-25 Eden
  • 1959: same
SH-51
SH-52
Former SH-52A
SH-53
  • Washington to US-95
  • 1959: same
SH-54
  • SH-41 to Bayview
  • 1959: same
SH-55
  • US-95 Marsing to US-95 New Meadows
  • 1959: N/A; was SH-72, SH-69, SH-15
Former SH-55
  • Until 1955: US-2 Colburn to US-10A Culver
  • 1959: N/A
Former SH-56
  • Until 1955: US-95 Sagle to Midas
  • 1959: N/A
SH-57
SH-58
  • Washington to US-95
  • 1959: same
Former SH-59
  • 1959: ???
SH-60
  • Washington to US-95
  • Created in 1959
Former SH-60
  • 1959: ???
SH-61
  • Wyoming to US-89 Geneva
  • Existed by 1955 (minutes p. 110)
  • 1959: same
SH-62
  • US-95B Craigmont to SH-64/SH-162 Nezperce
  • 1959: N/A; was SH-12
Former SH-62
Former SH-63
  • 1959: ???
SH-64
  • SH-62/SH-162 Nezperce to SH-162 Kamiah
  • 1959: N/A; was SH-12
Former SH-64
  • 1959: ???
Former SH-65
  • 1959: ???
SH-66
  • Washington to US-95
  • 1959: same
SH-67
  • SH-78 Grand View to SH-51 Mountain Home
  • Created 1954
  • 1959: Mountain Home AFB to SH-51 Mountain Home; rest was N/A
Former SH-68
  • 194x: part of SH-22
  • existed by 1954 (minutes p. 38)
  • 1959: US-30 Mountain Home to SH-23 Gannett; now US-20
  • Idaho Central Highway?
SH-69
  • Kuna to I-84 Meridian
  • Existed by 1954 (minutes p. 89)
  • 1959: Kuna to SH-44 Eagle; now SH-69, SH-55
Former SH-70
  • 1959: Eaton to US-30N Weiser; now N/A
SH-71
  • Oregon to US-95 Cambridge
  • Created in 1957
  • 1959: same
SH-72
  • US-30 to SH-52
  • 1959: N/A; was SH-52?
Former SH-72
  • existed by 1954 (minutes p. 32)
  • 1959: US-95 Marsing to US-30 Nampa; now SH-55
Former SH-73
SH-74
  • US-93 to US-30 Twin Falls
  • 1954 (minutes p. 29): still SH-26
  • 1955 (minutes p. 132): SH-74
  • 1959: same
SH-75
  • US-26/US-93 Shoshone to US-93 Challis
  • 1959: N/A; was US-93
Former SH-75
  • 1959: US-93 Ketchum to Sun Valley; now N/A
  • Sun Valley Spur (1954 minutes p. 51; doesn't call it SH-75)
Former SH-76
  • Until 1954: Richfield north
  • 1959: N/A
SH-77
  • SH-81 Malta to I-84 Rupert
  • Existed by 1955 (minutes p. 132)
  • 1959: Albion to US-30N Rupert; rest was N/A
SH-78
  • SH-55 Marsing to I-84B Hammett
  • 1959: N/A; was N/A
Former SH-78
  • 1959: ???
SH-79
  • I-84 to Jerome
  • Existed by 1955 (minutes p. 132)
  • Until 1957: US-93 Twin Falls to US-93 south of Shoshone
  • 1959: US-93 Twin Falls to SH-25 Jerome; now I-84, SH-79
  • Jerome Branch of Sawtooth Park Highway
Former SH-80
  • Existed by 1955 (minutes p. 104)
  • 1959: SH-48 Menan to US-20 Lorenzo; now N/A
SH-81
  • SH-77 Malta to US-30/I-84B Burley
  • 1959: N/A; was US-30S
Former SH-81
  • 1959: ???
Former SH-82
  • 1959: ???
Former SH-83
  • 1959: ???
I-84
  • Oregon to Utah
  • 1959: N/A; was US-30, SH-25, US-30S
Former SH-84
  • Created 1957
  • 1959: US-20 Macks Inn to Big Springs; now N/A
Former SH-85
  • 1959: ???
I-86
  • I-84 to I-15 Pocatello
  • 1959: was US-30N
Former SH-86
  • Existed by 1954 (minutes p. 90): SH-35 Dayton to US-91 Preston; now SH-36
  • 1959: shown but unlabeled
SH-87
  • US-20 to Montana
  • 1959: N/A; was N/A
Former SH-87
  • 1959: ???
Former SH-88
  • Created in 1958
  • 1959: US-20 Arco to US-20 Rexburg; now SH-33
US-89
  • Utah Fish Haven to Wyoming Geneva
  • 1959: same
I-90
  • Washington to Montana
  • 1959: was US-10
US-91
US-93
  • Nevada to Montana Lost Trail Pass
  • 1959: same; used SH-75 Shoshone to Challis and was US-93A
Former US-93A
  • 1959: US-93 Shoshone to US-93 Challis; now US-93
US-95
Former US-95A
  • 1959: US-95 Potlatch to US-95 Coeur d'Alene; now SH-6, SH-3, SH-97
Former SH-96
  • Created in 1959: US-20 north of Macks Inn to Montana Reynolds Pass; now SH-87
SH-97
  • SH-3 to I-90 Coeur d'Alene
  • 1959: N/A; was US-95A
SH-99
  • SH-3 Kendrick to SH-8 Troy
  • 1959: N/A; was N/A
SH-128
  • Washington Lewiston to US-12 Lewiston
  • 1959: N/A; was N/A
SH-162
  • SH-62/SH-64 Nezperce to US-12 Kamiah
  • 1959: N/A; was SH-12
I-184
  • I-84 Boise to US-20 Spur/US-26 Spur Boise
  • 1959: N/A; was N/A
Former US-191
SH-200
  • US-95 Sandpoint to Montana
  • 1959: N/A; was US-10A
Former US-410
  • 1959: Oregon Lewiston to US-95 Lewiston; now US-12
Unknown
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