The Scrooge Index: see the richest and least charitable ZIP codes in the nation

Some cities are more charitable than others. But which cities tend to be the richest and least charitable? Here's a list of the most Scrooge-like ZIP codes in the U.S., according to a Deseret News analysis. The list is based on 2008 tax data from the Internal Revenue Service, the most recent available. The rankings are based on the areas that earn over $100,000 in adjusted gross income and that donate the smallest percentage of their income to charities. The 50 areas are listed by percentage of income donated. Adjusted gross income is gross income minus allowable adjustments such as medical expenses, unreimbursed business expenses and alimony, according to Investopedia.com.