Dera Ismail Khan District (Pashto: ډېره اسماعیل خان ولسوالي, Balochi: ڈیرہ عِسمائیل خان, Urdu: ضلع ڈیره اسماعیل خان, Saraiki: دیرہ اسماعیل خان ; often abbreviated as D.I. Khan) is a district in Dera Ismail Khan Division of Khyber Pakhtunkhwa province in Pakistan. The capital of the district is the town of Dera Ismail Khan. The district has an area of 9,334 km2 (3,604 sq mi) and a population of 1,627,132 as of the 2017 Census. From Wikipedia
