The latest report in Q3 2014 (reported by App Annie)
Here are Top 5 Countries by downloads (iOS App Store)
Rank
1 United States
2 China
3 Japan
4 United Kingdom
5 Russia
Top 5 Countries by downloads (Google Play)
1 United States
2 Brazil
3 India
4 Russia
5 South Korea
Top 5 Countries by Revenue (iOS App Store)
1 United States
2 Japan
3 China
4 United Kingdom
5 Australia
Top 5 Countries by Revenue (Google Play)
1 Japan
2 United States
3 South Korea
4 Germany
5 Taiwan