Previous SC 640's:
1946 ROUTE LOG
SC 64: 0 - 0
SC 65: 11.5 - 11.5
Dorchester-Colleton Line: 1.0 - 12.5
SC 173: 2.0 - 14.5
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SC 640: Appeared in 1939 as new primary routing from SC 64 (now US 17 ALT) Walterboro northeast to SC 65 (now SC 61)
In 1942, SC 640 was extended north as new primary routing across the Edisto River to end at SC 173 (now S-18-30)
In 1947, SC 640 was downgraded to S-15-21 west of SC 65; S-15-39 btw SC 65 and Edisto River (now also S-15-21); and S-18-29.
SC 640 east of Walterboro
1939 Official
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SC 640 extended to SC 173
1942 Official
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