Administrative divisions of Bihar
Structurally Bihar is divided into divisions ), districts, sub-divisions & circles. The state is divided into 9 divisions, 38 districts, 101 subdivisions and 534 circles. 12 municipal corporations, 88 Nagar Parishads and 154 Nagar Panchayats for administrative purposes.
Divisions
| Map | Division | Headquarter | Area | Population*2011 | #District | Districts |
| Tirhut | Muzaffarpur | 17,147 km2 | 21,356,045 | 6 | West Champaran | |
| Tirhut | Muzaffarpur | 17,147 km2 | 21,356,045 | 6 | East Champaran | |
| Tirhut | Muzaffarpur | 17,147 km2 | 21,356,045 | 6 | Muzaffarpur | |
| Tirhut | Muzaffarpur | 17,147 km2 | 21,356,045 | 6 | Sitamarhi | |
| Tirhut | Muzaffarpur | 17,147 km2 | 21,356,045 | 6 | Sheohar | |
| Tirhut | Muzaffarpur | 17,147 km2 | 21,356,045 | 6 | Vaishali | |
| Patna | Patna | 16,960 km2 | 17,734,739 | 6 | Patna | |
| Patna | Patna | 16,960 km2 | 17,734,739 | 6 | Nalanda | |
| Patna | Patna | 16,960 km2 | 17,734,739 | 6 | Bhojpur | |
| Patna | Patna | 16,960 km2 | 17,734,739 | 6 | Rohtas | |
| Patna | Patna | 16,960 km2 | 17,734,739 | 6 | Buxar | |
| Patna | Patna | 16,960 km2 | 17,734,739 | 6 | Kaimur | |
| Magadh | Gaya | 12,345 km2 | 10,931,018 | 5 | Gaya | |
| Magadh | Gaya | 12,345 km2 | 10,931,018 | 5 | Nawada | |
| Magadh | Gaya | 12,345 km2 | 10,931,018 | 5 | Aurangabad | |
| Magadh | Gaya | 12,345 km2 | 10,931,018 | 5 | Jehanabad | |
| Magadh | Gaya | 12,345 km2 | 10,931,018 | 5 | Arwal | |
| Purnea | Purnea | 10,009 km2 | 10,838,525 | 4 | Purnia | |
| Purnea | Purnea | 10,009 km2 | 10,838,525 | 4 | Katihar | |
| Purnea | Purnea | 10,009 km2 | 10,838,525 | 4 | Araria | |
| Purnea | Purnea | 10,009 km2 | 10,838,525 | 4 | Kishanganj | |
| Munger | Munger | 9,862 km2 | 6,120,117 | 6 | Munger | |
| Munger | Munger | 9,862 km2 | 6,120,117 | 6 | Jamui | |
| Munger | Munger | 9,862 km2 | 6,120,117 | 6 | Khagaria | |
| Munger | Munger | 9,862 km2 | 6,120,117 | 6 | Lakhisarai | |
| Munger | Munger | 9,862 km2 | 6,120,117 | 6 | Begusarai | |
| Munger | Munger | 9,862 km2 | 6,120,117 | 6 | Sheikhpura | |
| Darbhanga | Darbhanga | 8,684 km2 | 15,652,799 | 3 | Darbhanga | |
| Darbhanga | Darbhanga | 8,684 km2 | 15,652,799 | 3 | Madhubani | |
| Darbhanga | Darbhanga | 8,684 km2 | 15,652,799 | 3 | Samastipur | |
| Saran | Chhapra | 6,893 km2 | 10,819,311 | 3 | Saran | |
| Saran | Chhapra | 6,893 km2 | 10,819,311 | 3 | Siwan | |
| Saran | Chhapra | 6,893 km2 | 10,819,311 | 3 | Gopalganj | |
| Kosi | Saharsa | 5,899 km2 | 6,120,117 | 3 | Saharsa | |
| Kosi | Saharsa | 5,899 km2 | 6,120,117 | 3 | Madhepura | |
| Kosi | Saharsa | 5,899 km2 | 6,120,117 | 3 | Supaul | |
| Bhagalpur | Bhagalpur | 5,589 km2 | 5,061,565 | 2 | Bhagalpur | |
| Bhagalpur | Bhagalpur | 5,589 km2 | 5,061,565 | 2 | Banka |