Previous SC 644's:
  1946 ROUTE LOG 
SC 64: 0 - 0 
SC 145: 5.3 - 5.3 
US 21: 8.9 - 14.2 
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SC 644: Appeared in 1940 as new primary routing from SC 64 near Walterboro to US 21 near Smoaks.
 In 1946, SC 644 was downgraded to S-15-24.  
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 SC 644 in central Colleton County
  1940 Official
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