St. John's is a member of the Wisconsin Evangelical Lutheran Synod. WELS is the third largest Lutheran church body in North America with over 370,000 members attending 1,300 congregations in 49 states and four provinces of Canada. Headquartered in Waukesha, it carries out mission work in 23 countries around the world. St. John's contributes to the work of WELS with its gifts and offerings.
Located only seven minutes from Wisconsin Lutheran Seminary, St. John's welcomes students and their families to worship and has often been served by students as guest preachers and interns.
St. John's pastor also serves as pastor at Trinity Lutheran Church, 11458 N. Wauwatosa Road, Mequon.
For many years St. John's has supported Kettle Moraine Lutheran High School located on Division Road in Jackson. With some 400 students, this school, affiliated with WELS, serves families in Ozaukee and Washington Counties.