Income Needed For Daily Happiness Varies Regionally: Map

From Gallup, "Income Buys Happiness Differently Based on Where You Live" by Dan Witters and Diana Liu:

In the U.S., the chances of experiencing three positive emotions or actions -- happiness, enjoyment and smiling/laughter -- on any given day increases with household income. But those chances reach their limit at around $75,000 per year.

This limit varies regionally, however. Some areas maximize positive emotions at much lower income levels than others.

For example, adult residents of the West North Central and West South Central regions both reach their peak emotional potential at around $54,000 per year. Residents of the East North Central region, on the other hand, require heftier incomes -- at least $120,000 per year -- to achieve the same level.