Jonai is a Sub-District (Tehsil/Block/Mandal) in the Dhemaji District of Assam. As par Census 2011 information the sub-district code of Jonai is 02057. There are about 6 sub-districts in Dhemaji and Jonai is one of them. Dhakuakhana, Dhemaji, Gogamukh, Sissibargaon, Subansiri etc. are other sub-districts in Dhemaji.There are about 374 villages in Jonai sub-district, which you can browse from villages list.