Grace Lutheran Church, 3381 E Puetz Rd, Oak Creek, WI 53154, US

The National Association of Congregational Christian Churches is a voluntary association of churches committed to fellowship with each other. The national offices are right here in Oak Creek. Congregational Christian Churches have founded colleges at home and planted missions abroad, "with intellectual freedom responsibility before God as guiding values," according to its website. Voluntary membership in the organization allows a local church to join in efforts it may not otherwise be able to undertake while still maintaining full control of its own affairs.