The US Supreme Court Justices Database: this database contains information on individuals nominated (whether confirmed or not) to the US Supreme Court, starting with John Jay and continuing to Sonia Sotomayor. There are 263 variables in the categories of background characteristics, nomination and confirmation, service on the court and departure from the bench.
Attributes of US Federal Judges Database: includes information on personal, social, economic, career and political attributes of judges at both US Courts of Appeals and District Court levels. The Courts of Appeals dataset includes full information on judges who served from 1801 - 2000, and partial data on judges from 2000-2004.
Attributes of US Federal Judges Database: includes information on personal, social, economic, career and political attributes of judges at both US Courts of Appeal and District Court levels. The District Court Attributes dataset includes full information on judges who served from 1789 - 2000, and partial data on judges from 2000-2004.
The State Court Organization data series: information on the structure and framework of state trial and appellate courts. Includes information on selection and service requirements of judges, the governance, finance and administration of the judicial branch and the composition and workings of state juries. Data were collected in 1980, 1987, 1993, 1998, 2004 and 2011.
State Court Districts: from the US Census bureau, this site provides the State Court districts for each state. It also has basic statistical information on each district, including information on the number of judges and how they are elected.
The National High Courts Database: includes information on decisions by the high courts of eleven countries, over an extended period of time. Countries include Canada, India, and Australia, amonst others.
Court of Justice of the European Union: the annual report of the ECJ includes statistics on the activitie of the Court of Justice as well as the General Court and the Civil Service Tribunal. Reports go back to 1997.