Demography
As per population figures of 2011 Census, detail is as follows-
| Population | 3921971 |
| Population density | 1101 per sq. km |
| Population growth | 19% |
| Sex ratio | 910 per 1000 male |
| Literacy rate | 44% |
| Languages spoken | Maithili, Hindi and Urdu |
| Area | 2279 Sq. Km | No. of Revenue Division | 1 |
| No. of Taluks | 18 | No. of Revenue Mandals | 3 |
| No. of Gram Panchayat | 324 | No. of Municipal Council | 1 |
| No. of Municipal Corporation | 1 | No. of Census Block | 18 |
| No. of of Revenue Villages | 1269 | No. of Circles | 18 |