San Gimignano The postal code for San Gimignano in the province of Siena, Italy is 53037 2.5 Natural scenery Introduction San Gimignano Address The postal code for San Gimignano in the province of Siena, Italy is 53037 Website https://maps.google.com/?q=53037+San+Gimignano,+Province+of+Siena,+Italy&ftid=0x132a3c3831446b6f:0x4c4ef55452f54491