High Quality Content by WIKIPEDIA articles! The Evangelical Lutheran Church in America (ELCA) is a mainline Protestant denomination headquartered in Chicago, Illinois. The ELCA officially came into existence on January 1, 1988, by the merging of three churches. As of December 31, 2009, it had 4,543,037 baptized members, with 2,527,941 of them counted as active participants in their congregations. It is the seventh-largest religious body and the largest Lutheran denomination in the United States. The next two largest Lutheran denominations are the Lutheran Church–Missouri Synod (with approximately 2.41 million members) and the Wisconsin Evangelical Lutheran Synod (with approximately 390,000 members). There are also many smaller Lutheran church bodies in the United States.