|Time zone||IST (UTC+5:30)|
As of 2001[update] India census, Semariya had a population of 12,325. Males constitute 54% of the population and females 46%. Semariya has an average literacy rate of 60%, higher than the national average of 59.5%: male literacy is 69%, and female literacy is 49%. In Semariya, 17% of the population is under six years of age.
Semariya has been made Legislative Assembly Area now, there would be a separate MLA for Semariya from next state elections. Currently it comes under Sirmaur while Block Development Office is still in Sirmaur. Its PIN code is 802125.
Semariya is surrounded by a range of pilgrimage centre like Dharkundi (monks shelter in lap of forest ranges), 15 km, Birshinghpur' (famous and ancient Gavinath Shivalinga), 21 km, Chitrakut, 90 km. Basaman Mama(Yaksha God), 11 km, is also very famous worship place for local people which is situated in bank of large Tons river. Tons(also called Tamas) river's water is stored in Bakia Dam and released for hydel power station (THP) through large canals. THP with three generating units generates more than 300MW of electric power for more than eight months in a year.
Semariya is the only big market for more than 100 villages in its province. A shopping complex with more than 100 shops has also been made by Laxman Bag trust, Semariya. It has one government aided YPSPG college for Arts, Science and Commerce faculties and two government higher secondary schools (each for boys and girls), however there are half dozen of Private Schools like Sarashwati Shishu Mandir, Gyan Jyoti English School, Gulab Shishu Mandir.
It's also giving a pool of talents to the country and many scholars are working in civil services as well as software and manufacturing industries. There are more than five cement factories near Semariya within range of 40 km.
Mr Abhay Mishra of Bharatiya Janata Party (BJP) is current MLA of Semariya constituency.
Mr. Ajay Shukla is newly elected Nagar Panchayat Adhyaksha (President, Municipal Corporation for 5 years term 2014-2018. he also hails from Congress and defeated his closest candidate by more than 1000 votes.
- "Census of India 2001: Data from the 2001 Census, including cities, villages and towns (Provisional)". Census Commission of India. Archived from the original on 2004-06-16. Retrieved 2008-11-01.