List of state highway loops in Texas (300–399)

Loop 300 was a proposed route in Snyder. It was designated on February 23, 1956, from US 180 west of the city, around its west and south sides, to US 84 southeast of it. The route was never built, and the designation was cancelled on October 1, 1968. ==Loop 301==

Loop 301 is located in Sulphur Springs. It runs from the junction of SH 19 and SH 154 to I-30/US 67. Loop 301 was designated on February 23, 1956, from US 67 (later Loop 313; now Bus. US 67) and SH 19 in west Sulphur Springs, northward to SH 154. On September 21, 1965, it was extended southeast to I-30. On April 27, 1967, the section from SH 154 southwest to Loop 313 was transferred to SH 19. ==Loop 302==

Loop 302 was located in Greenville. It became Bus. US 67, which is now Spur 302. ==Loop 304==

Loop 304 is a beltway within Crockett, the county seat of Houston County. It is in length. It was established in on March 28, 1956. Nearly all of the loop is two lanes wide (one lane in each direction), and provides access for long distance travelers and trucks to bypass the downtown core. Populated areas also dot outside the loop, but have less population density. ;Junction list ==Loop 305==

Loop 305 is located in La Pryor. Loop 305 was designated on March 28, 1956, as a loop off of US 83 when it was rerouted. Loop 305 begins at the intersection of US 83 and US 57 near the town's western boundary. Loop 305 begins running concurrent with US 57 before turning off onto North Pryor Avenue. The highway continues along North Pryor Avenue until ending at an intersection with US 83 near the town's northern boundary. ;Junction list ==Loop 306==

Loop 306 is a state loop that encircles much of San Angelo. Loop 306 begins on the north side of San Angelo, at the US 67/277 interchange, and continues south on the eastern edge of town. The highway multiplexes with US 87 while being routed west. The multiplex ends at the US 87/277/Loop 306 interchange, with Loop 306 routed northwest. Loop 306 ends at the Bus. US 67 (Sherwood Way) overpass, however the freeway continues and is signed as US 67, Houston Harte Expressway; named after the San Angelo-native publishing magnate. The route is often referred to locally as "the Loop" or "Loop 306", despite the terminus of Loop 306 at Sherwood Way. TxDOT upgraded portions of Loop 306 to expand it from a two-lane road to a four-lane divided highway. From the US 67/277 interchange, Loop 306 continues as a four-lane divided highway all the way to US 87. The upgrades included adding two overpasses and improvements to a divided highway. Loop 306 was designated on October 24, 1956. On July 30, 1976, the section from US 67 west and southwest to US 67 was transferred to rerouted US 67. ;Junction list {{TXint {{TXint|type=concur {{TXint|type=concur {{TXint|type=concur {{TXint {{TXint {{TXint ==Loop 307==

Loop 307 was a proposed route in Teague. It was designated on February 23, 1956, from US 84 (now Bus. US 84) north of Teague, east and south to SH 179, east of Teague. On October 21, 1959, part of the route was transferred to US 84 when that highway was rerouted. On November 25, 1975, FM 553 was designated on the remaining route, but Loop 307 was not cancelled until April 30, 2004. ==Loop 308==

Loop 308 is located in Briggs. Loop 308 was designated on June 22, 1956, as a loop off of US 183 when it was rerouted. ;Junction list ==Loop 310==

Loop 310 was located in Carrollton. It was designated on February 23, 1956, as a loop off US 77 (now I-35E). Loop 310 was cancelled on November 21, 1991, and returned to the city of Carrollton. ==Loop 311==

Loop 311 was located in Kilgore. Loop 311 was designated on August 1, 1956, from SH 259 (now SH 42) in downtown Kilgore west to SH 135 near the west edge of Kilgore. The route was signed as Bus. SH 135 rather than Loop 311. On June 14, 1968, Loop 311 was cancelled and removed from the highway system due to the completion of the rerouting of SH 42. ==Loop 313==

Loop 313 was located in Sulphur Springs. It ran along a former alignment of US 67. It is now Bus. US 67. ==Loop 315==

Loop 315 was located in Greenville. Loop 315 was designated on November 21, 1956, from US 69 near Peniel south to US 67 southwest of Greenville. On November 30, 1961, the road was extended east over old US 67 to I-30, and southeast to US 69 on October 13, 1971. On May 21, 1979, Loop 315 was routed over US 69 while the old route of Loop 315 was transferred to US 69. Loop 315 was cancelled on June 21, 1990, and transferred to Bus. US 69. ==Loop 316==

Loop 316 was located in Loraine. It is now Business I-20. ==Loop 318==

Loop 318 (1957) The first use of Loop 318 was in Callahan County, from US 380 west and north to FM 576, then east along FM 576 to US 380. Loop 318 was cancelled three months later and transferred to FM 880 and FM Spur 880. Loop 318 (1960) The second use of the Loop 318 designation was in Washington County, as a loop off US 290 in Brenham. This was the former routing of US 290 before it was rerouted on top of a section of Loop 283. On February 28, 1973, the section from US 290 west of Brenham to Market Street was transferred to SH 105. The remainder of Loop 318 was cancelled on June 21, 1990, and transferred to Bus. US 290. ==Loop 319==

Loop 319 was located in Trent. It is now Business I-20. ==Loop 320==

Loop 320 was located in Tye. It is now Business I-20. ==Loop 321==

Loop 321 is located in Wilson County. It is the former route of US 87 through La Vernia. ==Loop 322==

Loop 322 is a loop route in the city of Abilene in the U.S. state of Texas. It is located in Taylor County. ==Loop 323==

Loop 323 is a state highway loop in Texas in the United States. It is a highway circling the city of Tyler in Smith County. ==Loop 328==

Loop 328 is located in Carey. Loop 328 was designated on October 30, 1957, as a loop off of US 287 when it was rerouted. ==Loop 329==