State Highway 37 is a state highway that runs from US 69 in Mineola to the Oklahoma state line in the northeast corner of the state.

SH 37 was designated as a route on April 13, 1918 from Clarksville to Lufkin.^[2] On August 21, 1923, it was pared back, with everything north of Mt. Vernon either cancelled or transferred to the new SH 66, and the portion from Jacksonville to Lufkin transferred to SH 40. On May 23, 1927, it was extended north to Talco.^[3] On June 24, 1931, it was extended north to the Oklahoma state line, replacing SH 66.^[4] On July 15, 1935, everything north of Clarksville was cancelled.^[5] The section north of Clarksville was restored on December 20, 1937.^[6] On September 26, 1939, the stretch from Mineola to Tyler was transferred to U.S. Highway 69 (Cosigned with since 1934), with the remaining route continuing to the present.

SH 37A was designated on January 19, 1920 as a spur from Tyler to Troup.^[7] This was cancelled on November 27, 1922.^[8] SH 37A was restored on February 18, 1924, but from Tyler to New Summerfield.^[9] It was cancelled on March 19, 1930, as it became part of SH 110.

SH 37A was also designated on April 23, 1929 from Quitman to Cooper.^[10] This was renumbered to SH 154 on March 19, 1930.

County	Location	mi[11]	km	Destinations	Notes
Wood	Mineola	0.0	0.0	US 69 – Lindale, Tyler, Alba, Greenville	Southern terminus
		1.0	1.6	Loop 564
	​	6.0	9.7	FM 779 west – Golden
	Quitman	8.6	13.8	FM 778 south (Horton Street) – Mainesville
		8.8	14.2	SH 154 west / SH 182 west – Sulphur Springs, Lake Fork	South end of SH 154 overlap; western terminus of SH 182
		8.9	14.3	Loop 173 east / FM 2966 north (North Main Street) – Lake Quitman
		9.2	14.8	SH 154 east – Gilmer	North end of SH 154 overlap
		9.4	15.1	Loop 173 west (East Lane Street)
		9.8	15.8	FM 2088 east (Oak Grove Road)
	​	12.1	19.5	FM 69 north – Coke
	​	15.8	25.4	FM 1643 north – Cartwright
	​	17.9	28.8	FM 14 south – Hawkins
	Winnsboro	24.1	38.8	FM 515 – Coke, Pittsburg	Access to CHRISTUS Mother Frances Hospital - Winnsboro
		24.7	39.8	SH 11 / FM 852
Franklin	​	27.7	44.6	FM 3357 east
	Purley	34.2	55.0	FM 900 – Purley, Saltillo
	​	38.3	61.6	FM 21 south – Lake Cypress Springs, Lake Bob Sandlin
	Mount Vernon	39.3	63.2	I-30 – Dallas, Texarkana	I-30 exit 146
		40.9	65.8	US 67 south	South end of US 67 overlap
		41.2	66.3	US 67 north / Bus. SH 37 north – Mount Vernon, Mount Pleasant	North end of US 67 overlap
	​	42.4	68.2	Bus. SH 37 south – Mount Vernon
	​	52.0	83.7	FM 71 – Sulphur Bluff, Talco
Red River	​	56.0	90.1	FM 196 west – Cunningham
	Bogata	61.1	98.3	FM 909 north
		61.4	98.8	US 271 – Paris, Mount Pleasant
		61.8	99.5	Bus. US 271
		62.2	100.1	Spur 38 south
	​	65.9	106.1	FM 411 west – Fulbright
	​	73.4	118.1	FM 2825 north
	​	74.5	119.9	Bus. SH 37 north – Clarksville
	Clarksville	75.4	121.3	US 82 west / Bus. US 82 east – Paris, Clarksville	South end of US 82 overlap
		76.8	123.6	US 82 east / Bus. SH 37 south – New Boston, Clarksville	Interchange; north end of US 82 overlap
	​	80.1	128.9	FM 2283 west
	​	83.5	134.4	FM 2120 west – Bagwell
	​	86.8	139.7	FM 2118 west – Manchester
	​	93.0	149.7	FM 1159 south
	Albion	93.8	151.0	FM 195 west – Paris
		93.9	151.1	SH-37 east – Idabel	Continuation into Oklahoma
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Concurrency terminus

SH 37 has two business routes.

Business State Highway 37-C is a business loop that runs through Clarksville. The road was bypassed in 1992 by SH 37. It is concurrent with Business US 82.^[12]

Business State Highway 37-E is a business loop that runs through Mount Vernon. The route was created on February 27, 1997 when SH 37 was routed west of town.^[13]

• List of state highways in Texas
• List of highways numbered 37

Media related to Texas State Highway 37 at Wikimedia Commons