State Route 50 was originally a branch of SR-122, but was split off as its own route in 1935, running from Wattis southeast to SR-122 east of Hiawatha. This route was deleted in 1969, with the route number immediately reused for the road between Roy and Ogden (Riverdale Road), which was subsequently renumbered to SR-26 as part of the 1977 Utah state route renumbering in order to avoid confusion with US-50.
State Route 55 connected Cedar Breaks Junction on SR-14 to the south boundary of Cedar Breaks National Monument, a distance of about 2.5 miles (4.0 km). This route was designated on June 17, 1927 as part of SR-14, and split in 1931. It was withdrawn as a state route in 1969 and re-designated as part of SR-143. Later, in 1985, this route was split off from SR-143 and designated as a distinct highway, SR-148, while SR-143 was extended to run along the rest of Panguitch Lake Road, north and east of Cedar Breaks until US-89 in Panguitch. SR-148 now follows the same route of former SR-55. The SR-55 route number was reused in 1975 as a business loop for US-6 in Price.
State Route 64 - River Road from the Arizona state line north to SR-1 (US-91) in St. George - was added to the state highway system on May 12, 1931. It initially ran through St. George via 700 South, 700 East, 300 South, and 200 East, but was moved to use 700 East all the way to SR-1 (100 North) on January 25, 1963. After its deletion in 1969, the number was not reassigned until 1975, when it was used on what had been a spur of SR-26 through Holden.
State Route 67 served Dixie College in St. George connecting US-91 (SR-91, now SR-34) to the college. It was created in 1935 as SR-191, renumbered as SR-181A in 1945, and as SR-67 in 1962. As part of the renumbering of highways serving state institutions, it was renumbered as SR-281 in 1969. The 67 route number was reused in 2008 for the newly built Legacy Parkway.
The road from Parowan northeast through Paragonah and southwest through Summit was added to the state highway system in 1910, and in the 1920s it became part of SR-1 and US-91. In 1968, with the construction of I-15 in the area imminent, SR-1 was moved to the proposed bypass, and the old route of SR-1 became State Route 38 (I-15 near Summit to Center Street in Parowan), SR-143 (Center Street to near 500 North in Parowan, and then continuing to I-15), and State Route 76 (near 500 North in Parowan to I-15 near Paragonah). However, the state legislature did not concur with the latter, and the old road through Paragonah was maintained only until I-15 was completed. Construction of I-15 was finished by 1975, and included a second Parowan interchange that had not been in the 1968 plans. SR-143 was rerouted to turn south on SR-38 (old SR-1) in Parowan and west on 200 South to the new interchange, and the remainder of SR-38 was removed from the state highway system. (The 1968 extension of SR-143 was redesignated SR-274.) The road from Parowan through Paragonah to I-15 (former State Route 76) was restored to the state highway system in 1978 as SR-271.
State Route 86 ran from SR-6 in Bridgeland north via Upalco and Altamont to Altonah. It was added as a state highway on May 14, 1935. In 1964, the portion from Upalco to Altamont was transferred to SR-87, and the portion from Altamont to Altonah was transferred to former SR-221, leaving SR-86 with only about 10 miles of road. This short remainder was deleted in 1969, and the number was reused in 1975 to designate a highway that currently runs from Henefer to I-84.
State Route 136 was established on June 26, 1933 as the road from Kanab west to Johnson Canyon, then north to Alton, then west to SR-11 (now known as US-89) at Alton Junction, essentially forming an eastern loop off then SR-11. On May 14, 1957, the 8.1 miles (13.0 km) from Kanab to Johnson Canyon was split off as part of a new route, SR-259 (built to connect Kanab with then under construction Glen Canyon Dam and later became part of the mainline of US-89 and deleted in 1977). SR-136 was deleted in 1969 and reused in 1985 for a short connector between US-50 and US-6 just west of the city of Delta.
State Route 141 was established in 1933 as the road from Hatton east to what was then Route 1 (now SR-133), a distance of about 1.6 miles (2.6 km). The route was deleted in 1969 and the route number was immediately reused for current-day SR-141.
State Route 159, now known as "Dividend Road", was originally part of SR-26, where it went through the town of Dividend (now a ghost town) just east of Eureka. Dividend was bypassed by a new route through Homansville Canyon in about 1931, and the old route (Dividend Road) initially became a branch of SR-26. It was renumbered State Route 159 in 1945 and deleted from the state highway system in 1969.
State Route 167 was originally split off as the Mapleton end of State Route 147 in 1935. It was consolidated back into State Route 147 in 1969. The route number went empty until 1985, when it was used to designate Trappers Loop Road as a state highway.
State Route 181A was created in 1962 as three road segments on the campus of the University of Utah. These roads were originally added to SR-186 in 1935. In 1969, these roads were renumbered as SR-282.
State Route 182 was created in 1935, running along 20th Street from SR-1 (US-89) east to the former campus of the Utah Schools for the Deaf and the Blind at Monroe Boulevard. In 1962 it was extended east to Harrison Boulevard. SR-183A was created in 1939 and numbered in 1945, running east on 7th Street from SR-1 to what was then the Utah State Tuberculosis Sanatorium on the east side of Harrison Boulevard. This route was deleted in 1963, but after the sanatorium was replaced with a new campus for the Schools for the Deaf and Blind, the route was readded in 1968 as part of SR-182. In 1969, SR-182 was split and renumbered, with the original route (minus the segment on 20th street) becoming SR-285 and the newer readdition as SR-291.
State Route 182A was created in 1939 and numbered in 1945. It served the College of Eastern Utah, running from SR-55 (100 North) along 300 East, and then looping around the college for a total distance of about 1.33 miles (2.14 km). It was renumbered as SR-283 in 1969, which was deleted in 2001.
State Route 189 was a three-quarters loop around Snow College in Ephraim, following 100 North, 400 East, and Center Street from US-89 (Main Street) back to US-89, for a distance of 1.165 miles (1.875 km). The route was created in 1935, changed from a spur to a loop in 1965, and renumbered as Utah State Route 290 in 1969.
State Route 190 was a 1.920-mile (3.090 km) rectangular route around Southern Utah University in Cedar City. It followed Center Street from the intersection of SR-130 (Main Street) and SR-14 west to 1150 West, south to 200 South, east to 300 West, and back north to Center Street. It was created in 1935, and renumbered to SR-289 in 1969. The 190 route number was reused in 1987 for what is now the Big Cottonwood Canyon Scenic Byway.
State Route 205 ran from SR-104 (Wilson Lane) to Wall Avenue in Ogden. It was designated in 1965 for a new road to be constructed as part of the 1968 fiscal year urban program. In 1969, the route was deleted, and the roadway was transferred to SR-104.
State Route 222 ran from US-189 (then numbered SR-7) near Deer Creek Reservoir southeast to the town of Wallsburg, covering a little over 3 miles (4.8 km). It was designated a state route on May 13, 1941 and withdrawn in 1969. The route number was reused in 2004 to re-designate a portion of SR-244 as SR-222 in Midway.
State Route 236 was originally the southern branch of SR-122, running from Hiawatha to SR-10 north of Huntington, but was split off as its own route in 1945. The route was deleted in 1969 and as of April 2011[update], has not been reused.
^Utah State Legislature (1931). Chapter 55: Designation of State Roads. Session Laws of Utah. (26) From Holden northwesterly to Delta, thence northerly via Lynndyl, McIntyre and Silver City to Eureka, thence easterly via Homansville canyon, Elberta and Goshen to Santaquin, also easterly from Eureka via Dividend to Elberta.
^Utah State Legislature (1945). Chapter 61: State Roads and Routes. Session Laws of Utah. Route 26. From Holden on route 1 northwesterly via Harding to Delta, thence northerly via Lynndyl, and Tintic Junction to Eureka, thence easterly via Elberta and Goshen to Santaquin on route 1." "Route 159. From route 26 near Juab-Utah County line easterly via Dividend to route 26.
^Utah State Legislature (1933). Chapter 30. Session Laws of Utah. (122) From junction on route 10 near Carbon-Emery county line westerly to Hiawatha, and from Hiawatha Junction southerly via Mohrland to Huntington.
^Utah State Legislature (1945). Chapter 61: State Roads and Routes. Session Laws of Utah. Route 236. From route 10 north of Huntington northerly to route 122 near Hiawatha.