Historic routes

SH 6 was one of the original 25 state highways proposed on June 21, 1917, overlaying the King of Trails Highway.^[3] From 1919, the routing mostly followed present-day US 75 from Oklahoma to Dallas, then US 77 to Waco.

Current routes

On August 21, 1923, SH 6 was extended along the eastern Gulf Division branch of SH 2 to keep SH 2 from having two separate highways with the same number.^[4] In 1926, US 75 and US 77 were overlaid on northern SH 6 from Waco northward through the Dallas area to Denison, and US 75 was overlaid on the section from Houston to Galveston. In 1935, US 290 was overlaid on the section from Hempstead to Houston. While the routes were marked concurrently, the concurrent SH 6 kept its numbering until September 26, 1939, when SH 6 was truncated to the Gulf Division routing ending at Waco. It was rerouted south from Hempstead to Galveston, replacing SH 242 and SH 38.

On September 26, 1945, the roadway was extended northwest to Breckenridge over SH 67, continuing northwest to near Throckmorton along SH 157, which was decommissioned. That same day, the section in southeast Texas between Hempstead and Sugar Land was canceled, as it was redundant with the new FM 359. On August 20, 1952, the route was truncated on the north side, ending near Breckenridge. This section was transferred to US 183. On September 26, 1967, SH 6 was rerouted to bypass Bremond, with the old route through Bremond transferred to SH 14 and FM 46. On November 1, 1968, the section between Hempstead and Sugar Land was re-established, as it was routed along US 290 until it reached FM 1960, then replacing FM 1960 southward to where the southern branch of SH 6 intersected to what is now I-69/US 59 in Sugar Land. That portion of FM 1960 from US 290 to then US 90 at Addicks was built in the 1950s, replacing and rerouting some of what was known as Jackrabbit Road. In the early 1970s, the northern section underwent a massive rerouting due to realignments of numerous U.S. and state highways. On August 4, 1971, the section from Breckenridge south to Eastland was redesignated as SH 69. SH 6 was instead rerouted west along US 80 to Cisco, then replaced US 380 northwest to near Old Glory. The route was again extended on July 31, 1975, replacing SH 283 between Old Glory and Stamford northward to the Texas–Oklahoma border, completing the current routing of SH 6. The old route of SH 6 was transferred to new SH 283. On October 27, 1989, a section from US 90A to McKeever Road (McKeever Bypass) was added.^[1]

A spur, SH 6A was designated on August 1, 1928, from SH 6 to Texas City.^[5] On March 19, 1930, this route was renumbered as SH 146.

In June 2016, a section of the highway in Eastland County between Cisco and Albany was destroyed due to major flooding.^[6]

Marlin business loop

Business State Highway 6-N (Bus. SH 6-N, formerly Loop 23) is a business loop that runs from SH 6 near Marlin in central Texas. The road was bypassed on November 30, 1978 by SH 6 and designated Loop 23. The road was redesignated as Business SH 6-N on June 21, 1990.^[10][11]

Reagan business loop

Business State Highway 6-P (Bus. SH 6-P) is a 0.754-mile-long (1.213 km) business loop that runs near Reagan. The road was bypassed on June 25, 2015, by SH 6 when it was rerouted west.^[13] Bus. SH 6-P shares a short, one-block concurrency with FM 413 through Reagan. Both ends of the route are only accessible directly from SH 6 westbound. Access to SH 6 eastbound can only be reached via an interchange with SH 6 and FM 413.^[12]

Major intersections
The entire route is in Reagan, Falls County.

More information mi, km ...

mi[12]	km	Destinations	Notes
0.000	0.000	SH 6 west – Marlin	Western terminus; access to SH 6 west only
0.246	0.396	FM 413 south to SH 6 east / County Road 2903 – Calvert	Western end of FM 413 concurrency; access to SH 6 east via FM 413
0.312	0.502	FM 413 north / County Road 2902 – Kosse	Eastern end of FM 413 concurrency
0.754	1.213	SH 6 west – Marlin	Western terminus; access to SH 6 west only
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus       Incomplete access

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Bryan-College Station business loop

Business State Highway 6-R (Bus. SH 6-R, formerly Loop 507) is a business loop that runs through Bryan and College Station. The route runs on Texas Avenue in both cities. The route, created in 1972 when SH 6 was routed further north and east, is 12.5 miles (20.1 km) long.^[14] The road was redesignated as Bus. SH 6-R on June 21, 1990. It serves as the eastern boundary of Texas A&M University.

Navasota business loop

Business State Highway 6-S (Bus. SH 6-S, formerly Loop 508) is a business loop that runs through Navasota on La Salle Avenue. The route was created in 1972 when SH 6 was rerouted further north and east around town; it is 6.3 miles (10.1 km) long. The road was redesignated as Bus. SH 6-S on June 21, 1990.^[15]