How far will $100,000 take you in the U.S.? Here's where it's worth the most — and least.

While six figures represents a respectable salary in most of the U.S., $100,000 won't get you very far in big cities like New York, where the cost of living is extremely high. 

The purchasing power — money's value in terms of how much it can buy you — of a $100,000 salary dwindles in places like Manhattan and San Francisco, relative to more affordable U.S. cities. 

Federal and local taxes, plus the elevated cost of everyday necessities including housing, groceries, utilities, transportation and more can quickly erode the purchasing power of a six figure income, a new study from SmartAsset, a financial technology company, shows.