Pakistan is 35th Biggest country in the world having an area of 796,096Km2.
According to area abotabad is on 1st number while we talk about area,its area is 18,013Km2.
Attock is 2nd biggest city of Pakistan with an area of 6,857 Km2.
Sheikhupra has an area of 5,960Km2 and have a place of number 3rd.
Population wise Sargodha is not a big city but according to its area it has 4th place with area of 5,854Km2.
5) Swat District:
Sawat is the fifth biggest city according to its area 5,337Km2.
Note: Above figures of area are taken from latest record of google.