[2] The northern terminus is approximately three miles north of Streetman, in the southern section of Navarro County, where it becomes the east side frontage road for I-45.

[3] SH 75 was previously designated on August 21, 1923 to replace SH 13A from Goodnight east to the Oklahoma state line.

By 1927 it was running concurrently with the newly designated U.S. Highway 66, and was cancelled on September 26, 1939.

The current route was designated on January 28, 1987, replacing part of US 75 which was decommissioned south of Dallas.

Its original route from Richardson to Howe (south of Sherman) was redesignated as State Highway 5.