Demographics
According to the 2011 census Katihar district has a population of 3,068,149, roughly equal to the nation of Oman or the US state of Iowa. This gives it a ranking of 117th in India (out of a total of 640). The district has a population density of 1,004 inhabitants per square kilometre (2,600 /sq mi). Its population growth rate over the decade 2001–2011 was 28.23%. Katihar has a sex ratio of 916 females for every 1000 males, and a literacy rate of 53.56%.
Angika is the main language spoken in Katihar district.
Surjapuri language, north Bengal's native language is spoken in Barsoi subdivison of Katihar district . and Bengali language is also spoken in katihar
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