The World Christian Database (WCD) includes detailed information on all major world religions. Extensive religious and secular statistics are available on 9,000 Christian denominations, 238 countries and 13,000 ethnolinguistic peoples, as well as on 5,000 cities and 3,000 provinces. The WCD incorporates the core data from the World Christian Encyclopedia (WCE) and World Christian Trends (WCT). However, statistics in the WCD constitute a significant update of the data published in WCE/WCT in 2001. WCD is an initiative of the Center for the Study of Global Christianity at Gordon-Conwell Theological Seminary.