As per the 2011 census, Katihar Urban Agglomeration had a population of 240,565.[22] Katihar Urban Agglomeration includes Katihar (municipal corporation plus outgrowth) and Katihar Railway Colony (outgrowth).[23] Katihar Municipal Corporation had a total population of 225,982, out of which 119,142 were males and 106,840 were females. It had a sex ratio of 897. The population below 5 years was 31,036. The literacy rate of the 7+ population was 79.87 per cent.[24] Katihar is at 193rd rank in terms of its population among the top 200 cities of India as per the 2011 census.
Hinduism is major religion in Katihar city with 185,196 Hindus (76.9%) and 53,213 Muslims (22.1%). Other religions include 794 Christians (0.33%), 373 Sikhs (0.15%), 221 Jains (0.09%), 70 Buddhists (0.03%) and 960 (0.4%) not stated.[25]
The climate of Katihar has widespread rainfall during the monsoons, sometimes bringing floods to the adjoining rural areas of the Katihar District.[27][28]
