According to the Pew Forum study dated Oct 2009:
If the question asking about which region is having the highest Muslim population, then it is Asia-Pacific. If asking about the the country with highest Muslim population, then it Indonesia.
The details as follow:
The six Asian countries with the largest Muslim populations are: Indonesia (203 million), Pakistan (174 million), India (161 million), Bangladesh (145 million), Iran (74 million) and Turkey (74 million). Together these six countries are home to about 85% of Asia's Muslim population and more than half (53%) of the global Muslim population.
Refer to the link shown below for more information.
Indonesia has the largest Muslim population.
Bangalore is the highest Muslim papulated district in karnataka
Pakistan (174 millions Muslims population) is the second to Indonesia (203 millions Muslims population) in having the highest Muslims population.
Asia
Muslim. Indonesia is the highest Muslim population country in the world.
Asia
Michigan
Australia
Not including Turkey, Kosovo is the European country with the highest Muslim percentage of its population. 89.6% of Kosovo's population is Muslim.
Indonesia (more than 200 million Muslims)
Saudia Arabia.
assam