The area of the district is 6,605 square kilometers (2,550 sq mi).

[3] Its administrative center is the urban locality (an urban-type settlement) of Zaigrayevo.

Within the framework of administrative divisions, Zaigrayevsky District is one of the twenty-one in the Republic of Buryatia.

[1] It is divided into two urban-type settlements (administrative divisions with the administrative centers, correspondingly, in the urban-type settlements (inhabited localities) of Zaigrayevo and Onokhoy), ten selsoviets, and one somon, all of which comprise forty-three rural localities.

[6] The other urban settlement (Onokhoy Urban Settlement) within the municipal district incorporates the urban-type settlement of Onokhoy with the selo of Todogto and two rural localities in Dabatuysky Somon (the selo of Stary Onokhoy and the ulus of Onokhoy-Shibir).