Special 90% silver versions of each of the 50 State Quarters were produced by the US Mint and sold to collectors. The US Mint had been making a special 90% silver proof set since 1992. This continued in 1999, when the State Quarters series began. Each Silver State Quarter was included as part of the annual silver proof set. Later in the series, a separate Silver Proof State Quarters Set was issued. The coin specifications of the silver state quarters match pre-1965 circulating silver quarter dollar composition.

Silver State Quarter Coin Specifications
| Dates: |
1999 -2009 |
| Mints: |
San Francisco |
| Composition: |
90% silver |
|
10% copper |
| Weight: |
6.25 grams |
|
0.20 ounces |
| Diameter: |
24.26 mm |
|
0.96 inches |
quarters state
The 50 State Quarters series was created to issue circulating commemorative quarter dollar coins for each state in the order they joined the Union. This ambitious ten year program is often credited with bringing new life to the hobby of coin collecting and inspiring interest in collecting coins from pocket change. The obverse of the State Quarters used a modified version of the obverse from the prior Washington Quarters series. The reverse featured a design which highlighted the unique aspects of the state being honored. The series began by honoring Delaware in 1999 and concluded with Hawaii in 2009.

State Quarter Coin Specifications
| Dates: |
1999 -2009 |
| Mints: |
Philadelphia |
|
Denver |
| Composition: |
91.67% copper |
|
8.33% nickel |
| Weight: |
5.67 grams |
|
0.18 ounces |
| Diameter: |
24.26 mm |
|
0.96 inches |
quarters state