Federal district courts decide for themselves who can join their bar. Here they are grouped by the rule they use. Pro hac vice is a separate route available in most courts.
Only lawyers admitted to the bar of the court’s own state (or territory) may be admitted. Everyone else appears pro hac vice.
A lawyer in good standing in any state bar may be admitted.
A lawyer admitted to any state high court or any federal court (such as SCOTUS, a court of appeals or a district court) may be admitted.
A lawyer admitted in any state, or in any U.S. district court, may be admitted.
The home-state bar qualifies, but other lawyers need both a state bar and membership in a U.S. district court.
A lawyer admitted to the Supreme Court of the United States or the highest court of any state may be admitted.
Admission depends on having a principal law office, or bar membership, in a particular place.
Admission is limited to the bar of named jurisdictions or courts. Each district’s page names them.