The Yearbook of International Organizations includes detailed information on c. 73,000 international organizations from 300 countries and territories, c. 41,000 of which are active organizations. Coverage includes intergovernmental (IGOs) and international non-governmental organizations (INGOs). Approximately 1,200 new organizations are added each year.

The Yearbook is a trusted tool for studies and research in all subjects of civil society activities, including Political Science, Law, International Studies, International Relations, Sociology, Demography and Peace Studies.

The Yearbook data is edited by an experienced editorial staff and presented in a standardized format to facilitate comparison between organizations.

This is a paid service but the site includes an Open Yearbook with free access to limited subset of data.