It is the southernmost numbered route in the Texas state highway system.

[1] FM 1419 begins at an intersection with SH 4 west of downtown Brownsville.

The route travels to the southeast, along Southmost Road, to an intersection with FM 511.

On October 7 of that year, the northward extension from South Point to SH 4 was approved, replacing a section of FM 511.

[1] On June 27, 1995, the western section of the route, from SH 4 to FM 511, was officially redesignated as Urban Road 1419 (UR 1419), but that section was changed back to FM 1419 on November 15, 2018.