Federal courts — Clerk's Office addresses

Verified mailing addresses for 13 U.S. Courts of Appeals and 53 U.S. District Courts. Federal filing is mostly electronic (CM/ECF) — this is for pro se filers without e-filing access, required paper copies, and general correspondence.

U.S. Courts of Appeals

Appellate courts — one per circuit, hears appeals from the district courts below.

U.S. District Courts

Trial-level federal courts — where a federal civil or criminal case is actually filed. Coverage is growing; not every district is listed yet.

Addresses are verified against each court's own official website and re-checked periodically. Bankruptcy courts (the third federal trial-level system) aren't covered yet.