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Illinois v. Missouri

399 U.S. 146 · Decided June 22, 1970 · Supreme Court of the United States

Record summary. This page is generated from the Supreme Court Database’s coded data about the case. It describes who decided what, not the Court’s reasoning. Read the opinion itself before relying on it. Not legal advice.

At a glance

Illinois v. Missouri was decided on June 22, 1970 unanimously (8–0). SCDB classifies its main issue as “Boundary dispute between states” in the Interstate Relations area.

Read the opinion

Case details

Citations
399 U.S. 146 · 90 S. Ct. 2187 · 26 L. Ed. 2d 487 · 1970 U.S. LEXIS 21
Docket number
18 ORIG
Decided
June 22, 1970
Court era
Burger Court
Decision type
Decree
Outcome for petitioner
The petitioning party received a favorable disposition
Vote
8–0 (unanimous)
Opinion assigned by
Warren E. Burger
How the case arrived
Original jurisdiction
Decision direction (SCDB)
Unspecifiable what this means

How the Justices voted

JusticeVoteSeparate writing
Justice Hugo L. BlackMajority
Justice William O. DouglasMajority
Justice John M. Harlan IIMajority
Justice William J. Brennan Jr.Majority
Justice Potter StewartMajority
Justice Byron R. WhiteMajority
Justice Thurgood MarshallMajority
Chief Justice Warren E. BurgerMajority

Did not participate: Harry A. Blackmun.

Full case caption

Illinois v. Missouri

SCDB identifiers: case 1969-122, docket 1969-122-01.

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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