Map of overall predicted risk (OPR) for colorectal cancer, overlaid with boundaries in OPR and SMR. The fill color in the census tracts represents the OPR for colorectal cancer. This map also shows boundaries in OPR for colorectal cancer (dark green) and in male (orange) and female (yellow) colorectal cancer SMR. The gray lines define the census tract edges. The turquoise fill indicates the OPR for colorectal cancer, with darker regions having higher OPR. Boundaries in male and female colorectal cancer overlap significantly. Boundaries in OPR and both male and female colorectal cancers repel to a significant extent, primarily because geographic variation in OPR is concentrated in Western urban areas.