Texas Farm to Market Road 31 South Part 1/2

Farm to Market Road 31 (FM 31) is located in Harrison and Panola counties. The highway begins at US 59 (Future I-369) in Marshall, turning southeast while intersecting I-20 outside the city limits. In the community of Crossroads, FM 2625 passes through while FM 2199 ends completely, all while FM 31 continues southeastward. In the town of Elysian Fields, FM 451 ends as FM 31 heads into Panola County. The highway intersects US 79 in De Berry. The road has a small concurrency with FM 123 in Carthage. Further south, FM 2517 makes a four-way intersection there, where a few miles to the east FM 3359 is formed. The highway ends at the Louisiana state line, where it becomes LA 765.

FM 31 was designated on April 29, 1942, from US 59 in Marshall to Elysian Fields. On June 11, 1945, it was extended southward to the Panola County line. Seven days later, it was extended south to De Berry. On November 20, 1951, it was extended south to what was then FM 998. On January 7, 1952, FM 31 was extended southward to the Louisiana state line, replacing a section of FM 123 (which was rerouted over FM 998 instead).