In Yatsushiro City of Kumamoto Prefecture which had been the castle town of the Matsui clan, historical materials of the Matsui clan are displayed at the Yatsushiro Municipal Museum and Matsui Bunko Library, and in its vicinity, there remain sites of Yatsushiro-jo Castle and Shohinken which used to be Matsui clan's ochaya (rest house).
松井家の城下町であった熊本県八代市の八代市立博物館や松井文庫には松井歴代史料が展示されており、近くには八代城跡や松井家の御茶屋だった松浜軒（しょうひんけん）もある。