1964 is the last year the Mint struck circulating Washington quarters in 90% silver. One coin holds 0.18085 troy oz of silver at mint weight. Worn bag material is counted with other 90% at 0.715 oz per $1.00 face.
A 1965 quarter looks the same in the hand. It is copper-nickel clad. The fastest check if the date is worn: a silver quarter has a solid silver-colored edge; clad shows a copper stripe.
1932–1963 Washingtons are the same 90% melt as 1964. This page exists because people search the last silver year. Open the type for the full 1932–1964 run.
Full spec and quantity math: Washington quarter (90%) · Identify · US silver by year
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A local coin shop can make an offer. Melt is the metal floor, not a quote. Many shops buy generic gold and silver as a percent of that number.
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