By prefecture, Chiba Prefecture, where large manufacturers; Kikkoman Corporation (Noda city), YAMASA CORPORATION, Higeta Shoyu Co., Ltd. (Choshi City) are located accounts for 34%, Hyogo Prefecture where Higashimaru Shoyu Co., Ltd. (Tatsuno City) is located accounts for 16%, occupying the majority by them; the third is Aichi Prefecture (5%), the fourth is Kagawa Prefecture (4.5%), and so on.
都道府県別では、キッコーマン（野田市）、ヤマサ、ヒゲタ（いずれも銚子市）等の大手が存在する千葉県が34%、ヒガシマル（たつの市）が存在する兵庫県が16%と上位2県で過半数を占め、以下愛知県（5%）、香川県（4.5%）と続く。