Introduction The 50 State Quarters program (1999–2008) sparked massive collecting interest, with billions minted and most still worth just 25 cents. In 2026, however, certain rare state quarters—especially those with dramatic mint errors, superb gem condition, or low-mintage proof issues—command hundreds to thousands of dollars from eager collectors. Errors like extra leaves, doubled dies, and … Continue reading 10 Most Valuable State Quarters 2026 – Rare Coins Still in Circulation