1920s and 1930s SR 30 was established at least as early as 1919 on its current path from SR 7 in Cordele to the approximate location of Daisy, then east-southeast to
SR 38 in
Clyde, and then southeast, east-northeast, and northeast to
Savannah. At this time, part of SR 26 was established from Blitchton to Savannah. By the end of September 1921,
SR 63 was established from SR 30 in
Ellabell northeast to SR 26 in Blitchton. The eastern terminus of SR 38 was truncated to
SR 25 in
Midway. Its former path was redesignated as a northern extension of SR 25. By October 1926, the western terminus of SR 30 was extended northwest to
SR 28 west of
Vienna. The western terminus of SR 63 was shifted westward to Lanier. US 80 was designated on SR 26 from Blitchton to Savannah. The eastern terminus of SR 30 was truncated to
US 17/SR 25 southeast of Clyde. Its former path was redesignated as a northern extension of SR 25, with US 17 designated on it. Between October 1929 and June 1930, the western terminus of SR 30 was shifted west-southwestward to Americus. The western terminus of SR 63 was shifted westward to Pembroke. Between November 1930 and January 1932, US 280 was designated on SR 30 from Americus to Pembroke, on the entire length of SR 63 from Pembroke to Blitchton, and on US 80/SR 26 from Blitchton to Savannah. In the third quarter of 1937, the paths of SR 30, from Pembroke to southeast of Clyde, and SR 63 were swapped.
1940s to 1980s In 1942, the eastern terminus of US 280 was truncated to Blitchton. The next year, the western terminus of SR 30 was extended northwest to SR 41 south of Buena Vista. Between January 1945 and November 1946, the eastern terminus of SR 30 was extended southeastward on US 80/SR 26 from Blitchton to the southern part of Effingham County, north-northwestward on
SR 167 for a short distance, eastward to SR 21 north-northwest of
Industrial City Gardens, south-southeastward on SR 21 for a short distance, and eastward to the
Savannah National Wildlife Refuge. Between August 1950 and January 1952, SR 167 was redesignated as SR 17. Between June 1963 and January 1966, the entire length of SR 30 was hard surfaced. In 1973,
SR 704 was proposed from SR 30 west-northwest of
Monteith east-northeast to SR 21 north-northwest of Monteith. Between January 1979 and March 1980, the path of SR 30 in the Monteith area was shifted northward, replacing the proposed path of SR 704. ==Major intersections==