Case-Fatality Ratio, Population/mi2, Median Household Income, and Unemployment Rate in New Jersey. A total of 160 zip codes were included. The average CFR was 6.1% and ranged from 2.0% to 17.8%. The population/mi2 ranged from 173 to 53,316, with an average of 6,909. Additionally, the average median household income and unemployment rate was $80,763 (Range: $29,232-$154,688) and 5.8% (Range: 2.7%–17.4%), respectively.