How much is a 1964 quarter worth?
The value of a 1964 quarter in good condition is between $0.25 and $6.99. This will depend with its market value, as well as where you are selling it. Check out http://www.ebay.com/ctg/1964-Washington-Quarter-/101941696, and http://cointrackers.com/coins/494/1964-washington-quarter/.
According to this site:http://www.coinstudy.com/1964-quarter-value.html$4.67 for each quarter
Because of the high silver content, it starts at $4.50 and can go up to $7 or more in proof condition.