As of 2011 India census, Khair had a population of 48,251. Males constitute 54% of the population and females 46%. Khair has an average literacy rate of 54%, lower than the national average of 59.5%: male literacy is 62%, and female literacy is 44%. In Khair, 17% of the population is under 6 years of age.
Khair's main colonies are Block Colony, New Basti, Rohatgi Ganj, Malipura, Teachers Colony, and Omnagar. Other colonies & roads are , Maharaja Enclave, Sharafan, Musalmanan, Gautman, Upadhyan, Kumharan, Shikarwar Mohalla, Hetram Nagar, Garg Vihar, Sai Dham, Gopal Nagar, Kisan Nagar, Mohalla Harnarayan, Nai tehsil, Purani tehsil, Gandhi Chowk, Subhash Chowk, Kumharan Chowk, Vishanpuri Chauraha, Chhota Chauraha, Tentigaon Tiraha, Teliphone Exchange, Somna Road, Palwal Road, Tentigaon Road, Vishanpuri Road, Nayal Road, Fatte Nagla Road, Iglas Road, Aligarh Road. Khair is well connected to Delhi, Aligarh, Hathras, Mathura, Palwal, Noida and Ghaziabad.
Holi, Diwali and Dussehara are the most popular festival celebrated by citizens. Many people participate and others come to enjoy this festival.
There are many educational institutes in the city.
The main colleges of Khair is:G D Public School,Khair
DPS, Palwal Road, Khair
Gurukul Public School, Somna Road (CBSE)
Hem Vidya Niketan Sr. Sec. School, Palwal Road (CBSE)
DPS, Somna Road, Near Pathwari Mandir (CBSE)
NCC School (CBSE)
Rajkeeya Degree College, Somna Road
Khair Kanya Mahavidyalaya Bhopa Nagla Road
S.K.D.M Institute of Technology, Aligarh Road
S.K.D.M Degree & Polytechnic College
Khushiram Degree College
Khushiram Institute of Technology & Management
MSKS Kushwaha Degree College, Bhopa Nagla Road
MCS Educational Institute, Vajidpur
Jawahar Navoday Vidyalaya, Sujanpur
Khair Inter College, Palwal Road
RV Inter College, Palwal Road
Rashtriya Kanya Inter College, Palwal Road
Shri Ram Inter College
Shri Ram Kanya Inter college
Janta Inter College, Somna Road
Adarsh Vidyalaya Inter College, Tentigaon bypass Road
Bhagvati Devi Inter College, Manpur
S.K.D.M IT & Skill Development (Computer) Center, Azad Market
SBI Bank (Roadways Bus stand and one more at Block Colony)
Punjab National Bank
Bank of Barauda
HDFC Bank (Chandaus Adda, Teliphone Exchange)
Bank of India (Agrasen Market, Opp. Peepal Mandi)
Orientel Bank of Commerce
ICICI Bank (Aligarh Road, Opp. Jeevan Lodge)
Central Bank of India
Gramin Bank of Aryavart (Nai Basti)
Mostly Rohtagi from the Maharaj Harish Chandra Vansh community found in large numbers in Khair & Chaudhary, Nauhwar, Tomar, Dimanian. Gawar from the Jaat community are also found in large numbers in Khair. Also Kori Dalit, Sisodiya Thakur Chauhan Rajput & Gautam, Vashishtha, Parashar, Upadhyay, Bhardwaj of Brahmin and Jindal, Goyal, Varshney, Singhal, Bansal, Mittal, Agrawal subcaste of the Vaishya community. Verma sunaar, Brahmins are in majority in Khair consisting more than 20% of the population.