I have a VF page & controller that is querying accounts and putting them into a list, and them displaying the fields Account Name, State,and Last Activity.

I have a custom setting that is a list of zip codes (which is also a field on account) and their corresponding avg per capita income. 

I am able to get values from custom settings, but have trouble understanding iterating them to match the account data displayed.

Is using a map the best way to accomplish this?