India census, Unchahar had a population of 9305. Males constitute 51% of the population and females 49%. Unchahar has an average literacy rate of 57%, lower than the national average of 59.5%: male literacy is 66%, and female literacy is 48%. In Unchahar, 17% of the population is under 6 years of age.Located at Lucknow Allahabad Highway,115 KM from Lucknow and 85 KM from Allahabad ,Directly connected By Rail and Road to Kanpur,lucknow and Allahabad.10 KM from River Ganga.Unchahar is basically known for N.T.P.C Power plant, which has capacity of 1050 MW.there are 3 main schools in the N.T.P.C Campus ; first, oldest and largest is DAV Public School, run by DAV management, second is Chinmaya Vidyalaya, run by Chinmaya mission and the third is Saraswati Shishu Mandir.
Unchahar has a small residential area known as Mustafabad, which has given a lot of literary people to Urdu Language. Muharram is one of the most talk about ritual overthere.