Area Codes Japan The Area Codes of Japan: City/Town or Region Area code 1.Saga9522.Saitama4863.Saitama4874.Saitama4885.Sakai7226.Sapporo117.Sasebo9568.Sendai229.Shimonoseki83210.Shimonoseki83411.Shizuoka5412.Soka, Koshigaya48913.Suzu768