The club was founded in 2003 with the denomination of Cuoiopelli Cappiano Romaiano, as a merger between Cappiano Romaiano, a small team from Ponte a Cappiano, frazione of Fucecchio, who was just promoted to Serie C2 at the time, and Cuoio Pelli, a regionally more renowned Serie D team from Santa Croce sull'Arno.
The medieval town of Fucecchio is mentioned frequently in the opera Gianni Schicchi (1917) by Giacomo Puccini - one character, Simone, was once its podestà , and some of the estates to be distributed are situated there.
Born in Fucecchio, Manuela Falorni started her career in 1979, entering the Miss Italia pageant in which she was awarded as "Miss Toscana".
Castelfranco di Sotto borders the following municipalities: Altopascio, Bientina, Fucecchio, Montopoli in Val d'Arno, San Miniato, Santa Croce sull'Arno, Santa Maria a Monte.