Provides up-to-date statistics for all the countries and regions around the world. Data on inbound, domestic and outbound tourism is available as well as on tourism industries, employment and complementary indicators.
Provides statistics and insights on key indicators for inbound and outbound tourism at the global, regional and national levels
National and Regional Tourism Organisations
These organisations provide very useful statistics on tourism relating to a particular country or geographical region.
National Statistics Agencies are also helpful.
You can find these via a Google Search, for example: