Japan recently surpassed one million country code (.jp) registrations.
In doing so, it joins the following countries who also have more than a million country code registrations:
United Kingdom (.uk)
United States (.us)
Germany is the leader, with more than 11 million registrations, but China is gaining ground, with 8.4 million. The US has roughly 1.3 million registrations.
For the ultimate country code reference, see the Country Codes of the World poster.