With the original launch of the first iPhone in the US only, the majority of the consumers worldwide with access to the Apple App Store has been in the US. This is starting to change.
AdMob, one of the leading mobile advertising platforms, analyzed the number of iPhone’s in the market per country. They took Apple’s sales figures that were published in the June earnings call and combined this with the iPhone and iPod touch traffic AdMob sees from its mobile ad publishers.
These are the estimated number of iPhones and iPod touches sold per country since their launch according AdMob:

sold iPhones per country

sold iPod touches per country
54% of iPhone and iPod touch users were in the US in June 2009. This percentage has declined from 61% in January 2009, signaling that international user growth has outpaced US user growth. (via AdMob)
The US holds just over 50% of all consumers that have an iPhone, and access to the Apple App Store. With the number of sold iPhone’s and iPod touches growing faster outside the US, the consumers from other countries that have access to the store will quickly take up over 50%.
Since the App Store launch, the biggest part of both available applications and consumers having access was dominated from the US. Following the numbers described above, this is changing. Western Europe already has 26% share in all consumers worldwide with access to the store. The first examples of Europe specific applications with big uptake are visible.
If you are interested in learning more on country specific developments in app stores, check out our reports.