Demographics of Bihar Districts wise 
 District 
  
 Demographics 
 http://gov.bih.nic.in/Profile/Annexure-01.htm Population Distribution, Percentage Decadal Growth Rate, Sex-Ratio and Population Density

| Districts_of_Bihar | Total_Population_2001 | Male_Population_2001 | Female_Population_2001 | Growth_Rate_1981_91 | Growth_Rate_1991_01 | Sex_Ratio_1991 | Sex_Ratio_2001 | Population_density_1991 | Population_density_2001 |
|---|---|---|---|---|---|---|---|---|---|
| West Champaran | 3043044 | 1600853 | 1442191 | 18.30 | 30.40 | 877 | 901 | 446 | 582 |
| East Champaran | 3933636 | 2072350 | 1861286 | 25.46 | 29.27 | 883 | 898 | 767 | 991 |
| Sheohar | 514288 | 271261 | 243027 | 27.34 | 36.16 | 876 | 896 | 853 | 1161 |
| Sitamarhi | 2669887 | 1410149 | 1259738 | 23.13 | 32.58 | 884 | 893 | 915 | 1214 |
| Madhubani | 3570651 | 1837361 | 1733290 | 21.76 | 26.08 | 932 | 943 | 809 | 1020 |
| Supaul | 1745069 | 908855 | 836214 | 23.45 | 29.95 | 904 | 920 | 557 | 724 |
| Araria | 2124831 | 1108924 | 1015907 | 26.69 | 31.84 | 907 | 916 | 569 | 751 |
| Kishanganj | 1294063 | 666910 | 627153 | 22.20 | 31.50 | 933 | 940 | 522 | 687 |
| Purnia | 2540788 | 1325794 | 1214994 | 23.76 | 35.23 | 903 | 916 | 582 | 787 |