Non-real property dispute between states: Supreme Court decisions

Every U.S. Supreme Court decision from the 1946 through 2025 Terms that the Supreme Court Database classifies under the issue “Non-real property dispute between states,” part of the Interstate Relations area.

Legal provisions most often involved

All 41 decisions, newest first

• Delaware v. Pennsylvania and Wisconsin
  598 U.S. 115Decided February 28, 20239–0Ketanji Brown Jackson
• Florida v. Georgia
  592 U.S. 433Decided April 1, 20219–0Amy Coney Barrett
• Texas v. New Mexico
  141 S. Ct. 509Decided December 14, 20207–1Brett M. Kavanaugh
• Florida v. Georgia
  138 S. Ct. 2502Decided June 27, 20185–4Stephen G. Breyer
• State of Montana v. State of Wyoming and State of North Dakota
  577 U.S. 423Decided March 21, 20168–0
• State of Montana v. State of Wyoming and State of North Dakota
  563 U.S. 368Decided May 2, 20117–1Clarence Thomas
• State of South Carolina v. State of North Carolina
  558 U.S. 256Decided January 20, 20105–4Samuel A. Alito Jr.
• State of Kansas v. State of Colorado
  556 U.S. 98Decided March 9, 20099–0Samuel A. Alito Jr.
• State of Arizona v. State of California
  547 U.S. 150Decided March 27, 20069–0
• State of Kansas v. State of Colorado
  543 U.S. 86Decided December 7, 20048–1Stephen G. Breyer
• State of Kansas v. States of Nebraska and Colorado
  538 U.S. 720Decided May 19, 20039–0
• State of Nebraska v. States of Wyoming and Colorado
  534 U.S. 40Decided November 13, 20019–0
• State of Kansas v. State of Colorado
  533 U.S. 1Decided June 11, 20016–3John Paul Stevens
• State of Nebraska v. States of Wyoming and Colorado
  515 U.S. 1Decided May 30, 19958–1David H. Souter
• State of Kansas v. State of Colorado
  514 U.S. 673Decided May 15, 19959–0William H. Rehnquist
• State of Oklahoma and State of Texas v. New Mexico
  510 U.S. 126Decided December 13, 19939–0
• State of Nebraska v. States of Wyoming and Colorado
  507 U.S. 584Decided April 20, 19939–0Sandra Day O'Connor
• State of Delaware v. State of New York
  507 U.S. 490Decided March 30, 19936–3Clarence Thomas
• States of Oklahoma and Texas v. State of New Mexico
  501 U.S. 221Decided June 17, 19915–4Byron R. White
• State of Texas v. State of New Mexico
  494 U.S. 111Decided February 26, 19909–0
• Texas v. New Mexico
  482 U.S. 124Decided June 8, 19878–0Byron R. White
• Colorado v. New Mexico
  467 U.S. 310Decided June 4, 19848–1Sandra Day O'Connor
• State of Arizona v. State of California
  466 U.S. 144Decided April 16, 19848–0
• Idaho ex Rel. Evans v. Oregon
  462 U.S. 1017Decided June 23, 19836–3Harry A. Blackmun
• Colorado v. New Mexico
  459 U.S. 176Decided December 13, 19829–0Thurgood Marshall
• Maryland v. Louisiana
  452 U.S. 456Decided June 15, 19818–0
• Wisconsin v. Illinois
  449 U.S. 48Decided December 1, 19808–0
• Texas v. New Mexico
  446 U.S. 540Decided May 19, 19808–1Per curiam
• Idaho ex Rel. Evans v. Oregon
  444 U.S. 380Decided January 21, 19807–2William H. Rehnquist
• Arizona v. California
  439 U.S. 419Decided January 9, 19798–0
• Idaho ex Rel. Andrus v. Oregon
  429 U.S. 163Decided December 7, 19769–0Per curiam
• Pennsylvania v. New York
  407 U.S. 223Decided June 19, 19729–0William J. Brennan Jr.
• Pennsylvania v. New York
  407 U.S. 206Decided June 19, 19726–3William J. Brennan Jr.
• Arizona v. California
  383 U.S. 268Decided February 28, 19667–0
• Texas v. New Jersey
  380 U.S. 518Decided April 26, 19659–0
• Texas v. New Jersey
  379 U.S. 674Decided February 1, 19658–1Hugo L. Black
• Arizona v. California
  376 U.S. 340Decided June 3, 19639–0
• Illinois v. Michigan
  360 U.S. 712Decided June 29, 19599–0Per curiam
• California v. Washington
  358 U.S. 64Decided November 10, 19589–0Per curiam
• Wisconsin v. Tennessee.
  350 U.S. 955Decided January 30, 19568–0Per curiam
• Arizona v. California
  350 U.S. 114Decided December 12, 19555–3Per curiam

Source: Supreme Court Database, 2026 Release 01 (data file dated September 8, 2026). Imported into CaseTrail November 5, 2026. Coverage: decisions from the 1946 through 2025 Terms. Methodology · Report an error