What is the value of a 1964 US dime?

1964 is the most common date for silver dimes. In circulated condition its value is based only on the silver it contains, about 0.07 troy oz. Precious-metal prices change every day so any specific dollar value posted here would be out of date almost immediately. While it's not normal WikiAnswers policy to say "use the Internet", that's the best approach in this case. You can check a site such as kitco.com, CNNMoney, etc. for the latest spot prices and just multiply by 0.07. A dealer will pay half to 2/3 of that amount.

If the coin is uncirculated its value as of 07/2011 would be in the $4 to $10 range for the most commonly-found grades, but an absolutely top of the line coin (graded MS67) could sell for as much as $80.