As of 2001[update] India census, Maner had a population of 26,912. Males constitute 53% of the population and females 47%. Maner has an average literacy rate of 52%, lower than the national average of 59.5%: male literacy is 61%, and female literacy is 42%. In Maner, 19% of the population is under 6 years of age. Pincode of Maner is 801108. 
Srikant Nirala of RJD won the Maner seat (assembly constituency no. 192) defeating Sacchidanand Rai of JD(U) in October 2005 and February 2005. Bhai Birendra of SAP defeated Srikat Nirala of RJD in 2000. Srikant Nirala representing Janata Dal defeated Bhai Birendra (Independent) in 1995. Srikant Nirala representing Congress defeated Suryadeo Tyagi of Janata Dal in 1990. Rajmati devi representing Congress defeated Suryadeo Tyagi representing LKD in 1985. Ram Nagina Singh (Independent) defeated Suryadeo Tyagi of Janata Party (SC) in 1980. Suryadeo Tyagi representing Janata Party defeated Ram Nagina Singh representing Congress in 1977.