A map service providing census data within Santa Clara County. United States Census geometries with population statistics by race with numerical attributes for Santa Clara County. The diversity index for Santa Clara County ranges from; 0.53 to 1.44 (tract level), 0.41 to 1.46 (blockgroup) and 0 to 1.58 (block) and is calculated using the Shannon-Wiener Diversity Index. The higher the number, the more diversity. U.S. Census racial/ethnic classifications in this diversity index are White, Hispanic, Asian & Black. The closer the color is to grey (i.e. equal proportions) the more diversity. Each major racial/ethnic group has an assigned color representing the population concentration. The more intense the color, the higher the concentration. Urban/Low Population Census Tracts: Census Tracts which meet the following definition (as promulgated by the U.S. Census Bureau for Initial Urban Core Census Tract Unit Analysis); greater than 3 square miles and, if contiguous to these areas, having less than 500 persons per square mile have been classified as Rural/Low Population Census Tracts.