How many international organizations are there?

How many international organizations there are will depend on your criteria and methods for counting them. The Yearbook of International Organizations maintains statistics on the number of organizations listed that meets its criteria (see Types of organization for precise information on these criteria). Sample tables extracted from Volume 5 of the Yearbook are available on International Organizations by Type from the 1999/2000 edition, and International Organizations by Year and by Type from 1909-1996.