India census, Bilhaur had a population of 18,056. Males constitute 53% of the population and females 47%. Bilhaur has an averageliteracy rate of 53%, lower than the national average of 59.5%; with male literacy of 56% and female literacy of 49%. 15% of the population is under 6 years of age. Most of the community living here are Kurmi khsatriya's & Brahmins and Hinduism is the main religion.