Under the ritsuryo system, such kinds of zakko are known to have existed as Kudarabe (10 each under Okura-sho [Ministry of the Treasury] and Kuraryo [Palace Storehouse Bureau]), Kudarahe (11under Okura-sho and 10 under Kuraryo), Zokuko (Zoheishi [Weapons-Manufacturing Bureau], and Imonono Tsukasa [Casting Bureau] also has workers dispatched from Zoheishi and Kanuchibe of Kajishi [Smithery Bureau]), Kanuchibe (338 under Kajishi plus 217 for Zokuko of Zoheishi), Hakohe (197 under Kyotoshi [the Ministry of the Sovereign's Household]), Shiko/Umakai (302 under Samaryo [Left Division of Bureau of Horses] and 260 under Umaryo [Right Division of Bureau of Horses]) (government offices which zakko belonged to are shown in parentheses with number indicating the statutory number of zakko, which can be identified in Shikiinryo [law which stipulates duties of the ministries]).
律令制下で確認できる雑戸としては、百済手部（大蔵省・内蔵寮に各10）・百済戸（大蔵省11・内蔵寮10）・雑工戸（造兵司、典鋳司にも造兵司・鍛治司鍛戸から出向した者が所属）・鍛戸（鍛治司338・別個に造兵司雑工戸217）・筥戸（筥陶司197）・飼戸/馬甘（左馬寮302・右馬寮260）が存在した（括弧内は所属官司、数字は職員令などで確認可能な法定の戸数である）。