This study examines the locations of Protestant churches in the Chicago region between 1925 and 1990 based on data from the Church Federation of Greater Chicago. The analysis adds two insights to existing explanations of white flight and the corresponding suburbanization of churches: suburbanization patterns were not the same across Protestant groups and churches moving to the suburbs were adding to churches already present in those communities. As the percentage of suburban Protestant churches in the Chicago region started increasing after 1925, the new suburban locations were influenced by settlement patterns in the Chicago region—first along railroad lines and then in between with new sites easier to access by automobile—in addition to racial changes in Chicago neighborhoods and the ethnic composition of denominations. Suggestions for further research include examining the suburbanization of religious groups in more metropolitan regions (particularly beyond the North), comparing the discussions about moving to the suburbs across denominations and congregations, and considering how religious congregations have helped shape suburban communities.