Khagaria district is located in the northern part of Bihar. It is bordered by Saharsa and Supaul districts to the north, Bhagalpur district to the south, Madhepura district to the east, and Begusarai district to the west.

The district of Khagaria comes under the administrative division of Munger. It is further divided into four subdivisions: Khagaria, Gogri, Chautham, and Alouli. The district headquarters is located in the town of Khagaria.