How many federal Circuit courts does the US Supreme Court oversee?

Thirteen. Each Justice is assigned one or more Circuits over which he or she is responsible for emergency petitions and certain other administrative duties. The Supreme Court of the United States website (see Related Links, below) publishes a new list whenever the assignments change.

The list as of August 17, 2009, is posted below.

ALLOTMENT ORDER

It is ordered that the following allotment be made of the Chief Justice and the Associate Justices of this Court among the circuits, pursuant to Title 28, United States Code, Section 42 and that such allotment be entered of record, effective August 17, 2009.

For the District of Columbia Circuit, John G. Roberts, Jr., Chief Justice,

For the First Circuit, Stephen Breyer, Associate Justice,

For the Second Circuit, Ruth Bader Ginsburg, Associate Justice,

For the Third Circuit, Samuel A. Alito, Jr., Associate Justice,

For the Fourth Circuit, John G. Roberts, Jr., Chief Justice,

For the Fifth Circuit, Antonin Scalia, Associate Justice,

For the Sixth Circuit, John Paul Stevens, Associate Justice,

For the Seventh Circuit, John Paul Stevens, Associate Justice,

For the Eighth Circuit, Samuel A. Alito, Jr., Associate Justice,

For the Ninth Circuit, Anthony M. Kennedy, Associate Justice,

For the Tenth Circuit, Sonia Sotomayor, Associate Justice,

For the Eleventh Circuit, Clarence Thomas, Associate Justice,

For the Federal Circuit, John G. Roberts, Jr., Chief Justice.