SH 77 was originally proposed on August 21, 1923, as a route from Douglasville to Naples, replacing
SH 1B. On June 24, 1931, SH 77 was extended southeast to Louisiana, replacing a portion of
SH 47. On August 4, 1932, SH 77 was extended to
SH 11 (now US 259). On March 11, 1935,
SH 77 Spur was designated to
Marietta. This would be cancelled on completion, but would be restored on April 19, 1937, as
SH 245. On July 15, 1935, the section of SH 77 west of Naples was cancelled. On September 26, 1939, SH 77 was extended west to
Commerce, replacing
SH 260, but this plan was cancelled on January 14, 1941. On February 28, 1966, SH 77 was extended west over
FM 2880 from US 259 to US 67. ==Junction list==