In 2011, Khalilabad had population of 1,586,652 of which male and female were 869,656 and 845,527 respectively.
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In 2001 census, Khalilabad had a population of 1,220,226 of which males were 709,465 and remaining 600,761 were females.
After the good performance of party's Lok Sabha 2009 candidate from Sant Kabir Nagar, Dr Ayub won Khalilabad assembly seat in 2012 by 5392 votes by his rival Mashoor Alam (Bahujan Samaj Party).