Bihar: Largest Districts By Population as per Census 2011
As per the official census 2011 conducted by Directorate of Census Operations, following is the data of large districts of Bihar in terms of population.
| Largest District by Population in Bihar | Male | Female | Population |
| Patna | 3,078,512 | 2,759,953 | 5,838,465 |
| Purbi Champaran | 2,681,209 | 2,418,162 | 5,099,371 |
| Muzaffarpur | 2,527,497 | 2,273,565 | 4,801,062 |
| Madhubani | 2,329,313 | 2,158,066 | 4,487,379 |
| Gaya | 2,266,566 | 2,124,852 | 4,391,418 |
| Samastipur | 2,230,003 | 2,031,563 | 4,261,566 |
| Saran | 2,022,821 | 1,929,041 | 3,951,862 |
| Darbhanga | 2,059,949 | 1,877,436 | 3,937,385 |
| Pashchim Champaran | 2,061,110 | 1,873,932 | 3,935,042 |
| Vaishali | 1,844,535 | 1,650,486 | 3,495,021 |
| Sitamarhi | 1,803,252 | 1,620,322 | 3,423,574 |
| Siwan | 1,675,090 | 1,655,374 | 3,330,464 |
| Purnia | 1,699,370 | 1,565,249 | 3,264,619 |
| Katihar | 1,600,430 | 1,470,599 | 3,071,029 |
| Bhagalpur | 1,615,663 | 1,422,103 | 3,037,766 |
| Begusarai | 1,567,660 | 1,402,881 | 2,970,541 |
| Rohtas | 1,543,546 | 1,416,372 | 2,959,918 |
| Nalanda | 1,497,060 | 1,380,593 | 2,877,653 |
| Araria | 1,463,333 | 1,348,236 | 2,811,569 |
| Bhojpur | 1,430,380 | 1,298,027 | 2,728,407 |
| Gopalganj | 1,267,666 | 1,294,346 | 2,562,012 |
| Aurangabad | 1,318,684 | 1,221,389 | 2,540,073 |
| Supaul | 1,155,283 | 1,073,793 | 2,229,076 |
| Nawada | 1,144,668 | 1,074,478 | 2,219,146 |
| Banka | 1,067,140 | 967,623 | 2,034,763 |
| Madhepura | 1,047,559 | 954,203 | 2,001,762 |
| Saharsa | 997,174 | 903,487 | 1,900,661 |
| Jamui | 916,064 | 844,341 | 1,760,405 |
| Buxar | 887,977 | 818,375 | 1,706,352 |
| Kishanganj | 866,970 | 823,430 | 1,690,400 |
| Khagaria | 883,786 | 783,100 | 1,666,886 |
| Kaimur | 847,006 | 779,378 | 1,626,384 |
| Munger | 729,041 | 638,724 | 1,367,765 |
| Jehanabad | 585,582 | 539,731 | 1,125,313 |
| Lakhisarai | 526,345 | 474,567 | 1,000,912 |
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