According to "Kansei Choshu Shokafu" (genealogies of vassals in Edo Bakufu) which was compiled in the latter half of the 18th century, the Tanaka clan was from Tanaka Village, Takashima District, Omi Province (present-day Tanaka, Adogawa Town, Takashima City, Shiga Prefecture).
田中氏は、18世紀後半に編纂された『寛政重修諸家譜』によると近江国・高島郡田中村（現在の滋賀県高島市安曇川町田中)の出身であったという。