As of mid-2010 they're worth about $3.25 for their silver content but some dates and mint marks could be worth much more to a collector. Check for a mint mark under the bow of the wreath on the back (D, S, or nothing) and look for a previously-answered question in the form
What is the value of aA 1967 Washington quarter has no silver and is face value.
A 1949 Washington quarter is common, most are only valued for the silver, about $6.00
A 1964 Washington silver quarter contains 0.18084 troy ounces of silver. At current market prices, the value of the silver in a single quarter would be around $3.
The silver value is about 5-6 dollars.
The value is only for the silver about $3.25
A 1942 Washington quarter is common. If it has any wear, the value is just for the silver, about $3.50.
The 1967 Washington quarter has no silver and is still in circulation, the coin is face value.
The 1961 Washington quarter is so common if it has any wear at all the value is just for the silver about $3.00.
The 1970 Washington quarter was NOT struck in silver.
It's a common date Washington quarter, most are only valued for the silver, about $6.00.
The coin is the most common date/mintmark silver Washington quarter, unless it's a super high grade coin the value is just for the silver, about $5.00
7-29-11>>> 1964 is the most common date for a silver Washington quarter. Most are valued for the silver only, at $6.00 as of today.