A credit score of less than 600 usually results in credit denial or a higher sub prime interest rate. Whereas, credit scores of more than 700 usually qualify a person for the lower interest rates. Persons with a score of 760 or more usually get the lowest interest rates.  See image below for national average credit scores.
 

The median FICO score in the U.S. is 723

The average FICO score in the U.S. is 678

Please Note:  The national average credit score is 678 and a good credit score is 700 and above.   An amazing  58% of Americans have credit scores above 700.  The national average is only 678 because the average is being pulled down by some very low credit scores.  Remember, we are not talking about the median score (half above and half below), we're talking about an average score.

If you wish to improve your FICO score, we suggest you click here.