to know latitude and longitude of any city of country you can use Google Earth and Ecarta World Atals(Softwares)......
and this web list is also helpful:
http://www.mapsofworld.com/lat_long/...-lat-long.html
Latitude and Longitude of Sukkur City(Sindh) is:
27° 42' 0" N / 68° 52' 0" E