Change the color ranges. The first four colors cover only <=200 cases. There's no way to determine zipcodes that are hardest hit without going through dozens of red ones. There are at least 2 zips over 2k now. Legend should be more like:

0-500
501-1000
1001-1500
1501-2000
2001-2500
Greater than 2500

This legend will work for the next 6 wks hopefully. Then you will have to update again.