Sex-Ratio since 1991 for State and Districts of Bihar

SL	State/District	Sex- ratio ( Number of females per 1000 males)
		1901	1911	1921	1931	1941	1951	1961	1971	1981	1991	2001
1	2	3	4	5	6	7	8	9	10	11	12	13
	Bihar State	1,061	1,051	1,020	995	1,002	1,000	1,005	957	948	907	921
1.	West Champaran	1,022	1,026	1,004	985	976	957	944	918	911	877	901
2.	East Champaran	1,022	1,026	1,004	985	976	1,005	1,005	942	925	883	898
3.	Sheohar	1,089	1,092	1,079	1,037	1,048	1,009	1,019	967	922	876	896
4.	Sitamarhi	1,089	1,092	1,079	1,037	1,048	1,035	1,032	960	936	884	893
5.	Madhubani	1,056	1,074	1,051	1,015	1,036	1,063	1,056	991	982	932	943
6.	Supaul	1,014	1,006	983	966	964	965	950	930	937	904	920
7.	Araria	962	963	941	936	949	920	933	920	928	907	916
8.	Kishanganj	962	963	941	936	949	863	873	907	922	933	940
9.	Purnia	962	963	941	936	949	925	928	914	924	903	916
10.	Katihar	962	963	941	936	949	930	931	925	928	909	919
11.	Madhepura	1,014	1,006	983	966	964	916	928	902	919	885	915
12.	Saharsa	1,014	1,006	983	966	964	965	963	926	934	884	910
13.	Darbhanga	1,056	1,074	1,051	1,015	1,036	1,062	1,086	990	979	911	914
14.	Muzaffarpur	1,089	1,092	1,079	1,037	1,048	1,017	1,048	992	963	904	928
15.	Gopalganj	1,199	1,151	1,066	1,038	1,082	1,037	1,098	1,018	1,006	968	1,005
16.	Siwan	1,199	1,151	1,066	1,038	1,082	1,118	1,154	1,076	1,070	1,017	1,033
17.	Saran	1,199	1,151	1,066	1,038	1,082	1,132	1,148	1,052	1,019	963	965
18.	Vaishali	1,089	1,092	1,079	1,037	1,048	1,065	1,069	1,017	994	921	921
19.	Samastipur	1,056	1,074	1,051	1,015	1,036	1,008	1,039	967	972	926	927
20.	Begusarai	1,045	1,046	1,022	998	998	1,022	1,023	940	940	898	911
21.	Khagaria	1,045	1,046	1,022	998	998	939	943	894	902	868	890
22.	Bhagalpur	1,057	1,040	1,028	987	968	944	929	897	898	864	878
23.	Banka	1,057	1,040	1,028	987	968	987	985	940	931	893	908
24.	Munger	1,045	1,046	1,022	998	998	940	943	898	891	856	878
25.	Lakhisarai	1,045	1,046	1,022	998	998	988	995	944	928	880	923
26.	Sheikhpura	1,045	1,046	1,021	997	998	1,007	1,008	952	942	896	920
27.	Nalanda	1,020	988	949	931	935	969	967	933	927	898	915
28.	Patna	1,020	988	949	931	935	937	920	890	890	867	873
29.	Bhojpur	1,096	1,062	1,029	995	981	1,007	1,029	977	954	904	900
30.	Buxar	1,096	1,062	1,029	995	981	984	994	951	928	884	901
31.	Kaimur	1,096	1,062	1,029	995	981	962	976	932	907	884	907
32.	Rohtas	1,096	1,062	1,029	995	981	955	959	924	909	894	909
33.	Jehanabad	1,037	1,035	1,003	1,001	1,001	980	1,004	956	955	919	928
34.	Aurangabad	1,037	1,035	1,003	1,001	1,001	991	1,001	964	956	915	936
35.	Gaya	1,037	1,035	1,003	1,001	1,001	995	996	961	966	922	937
36.	Nawada	1,037	1,035	1,003	1,001	1,001	1,040	1,054	1,017	1,002	936	948
37.	Jamui	1,045	1,046	1,022	998	998	1,013	1,020	985	967	903	917