Five-year Age-adjusted Cancer Incidence Rates by Census Tracts Wilmington and Surrounding Area, 2001-2005 Map of Wilmington and Surrounding Area - Not Shown Note: Census tracts were accurately assigned to 96.5% of 22,023 cases diagnosed in Delaware between 2001 and 2005. For the remaining 3.5% of cases, census tract assignment was impossible due to missing or non- physical address information (for example; P.O. Box and Rural Route addresses). A total of 774 cases were eliminated from analysis because census tract assignment was impossible. For more information, see "Cancer Rater by Census Tract: Methodology". Source: Delaware Cancer Registry Map created by Delaware Health Statistics Center