Does a person's address influence how much they give to charity? The Chronicle analyzed tax and demographic data to determine that tax breaks, politics, faith - even the neighborhoods they call home - can have a profound effect on generosity. Regional differences in giving are stark: In states like Utah and Mississippi, the typical household gives more than 7 percent of its income to charity after taxes, food, housing, and other living expenses, while the average household in Massachusetts and three other New England states gives less than 2 percent. How America Gives explores these differences by state, city, county, and ZIP code and provides the most extensive analysis of generosity ever done. The project includes a sophisticated interactive database that allows online users to explore these differences and compare giving by community.