Portions of the route were formerly SH 71 and US 290 before they were rerouted onto Loop 293. On February 25, 1977 Loop 343 was rerouted along 1st Street (now Cesar Chavez Street) with the former route removed altogether. On November 10, 1986 the section from SH 71 north and east to IH 35 was removed from the highway system and returned to the city of Austin. Loop 344 is a state highway loop in Azle. Loop 344 was designated on November 22, 1960 as a loop off SH 199 in Azle as a replacement of SH 199 when it was rerouted. Loop 345 was a state highway loop in San Antonio. Loop 345 was designated on January 26, 1962 as a loop off IH 10 in San Antonio as a replacement of US 87 when it was rerouted. The route was signed as US 87 Business until 1992. On December 18, 2014 the section from Balcones Heights south to IH 10 was removed and returned to the city of San Antonio and the remainder was redesignated as Spur 345. Loop 346 was a state highway loop in Kemp. Loop 346 was designated on June 25, 1984 as a loop off US 175 in Kemp as a replacement of US 175 when it was rerouted. On June 21, 1990 Loop 346 was cancelled and transferred to Business US 175-D. State Highway Loop 350 (Loop 350) is a loop in Sealy, Texas. It runs from SH 36 via Sealy to SH 36. The number originally belonged to Spur 350, which was designated on April 19, 1961, from SH 121 to SH 183. On August 29, 1979, this became part of rerouted SH 183, and old SH 183 was renumbered SH 10. The current route was designated on February 7, 1983. Loop 352 was a state highway loop in Chico. Loop 352 was designated on August 29, 1961 as a loop off SH 114 (now SH 101) in Chico as a replacement of SH 114 when it was rerouted. On June 21, 1990 Loop 352 was cancelled and transferred to Business SH 101-B.  Loop 355 was a state highway loop in Abilene. Loop 355 was designated as a loop off IH 20 in Abilene as a replacement of US 80 when it was rerouted along the current IH 20. The route was signed as Business US 80 rather than Loop 355. On June 21, 1990 Loop 355 was cancelled and transferred to Business IH 20-R.  Loop 358 was a state highway loop in Orange.