From the Death Penalty Information Center:
The University of Michigan Law School and the Center on Wrongful Convictions at Northwestern University announced the start of the first National Registry of Exonerations and released an extensive report discussing the problem of wrongful convictions in the U.S. The Registry contains information on nearly 900 people who were falsely convicted of serious crimes, including many who were sentenced to death, and who have been exonerated since 1989. It is by far the largest collection of such cases and will be updated on an ongoing basis. The authors believe that many more such cases exist, including over 1,000 cases from “group exonerations” involving official misconduct that are discussed in the report.
While not entirely user friendly at times, this online registry is an incredible resource and shows the sheer volume of exonerations. It’s interesting to note that this registry uses different standards than the Death Penalty Information Center’s Innocence List, so there are different numbers of exonerees. DPIC uses the following criteria:
ii) all charges were dropped