Iowa Mutual Insurance Co. v. Laplante et al.

Decided February 24, 1987. Thurgood Marshall delivered the opinion of the Court.

Docket 85-1589 · 480 U.S. 9 (1987) · Cited 635 times

We don’t yet publish a summary of this opinion — read the official text below for the Court’s holding and reasoning.

How the Justices voted

Decided 8–1.

“Concurring” means agreeing with the outcome; any split shown is the Court’s judgment, not each Justice’s reasoning. Source: the Supreme Court Database (Spaeth et al.), Washington University.

Precedents cited

Supreme Court decisions this opinion relies on, ordered by how often it cites each. Cases in our collection link through; others are named.

• National Farmers Union Insurance v. Crow Tribe of Indians · 471 U.S. 845 (1985)
• Santa Clara Pueblo v. Martinez · 436 U.S. 49 (1978)
• Colorado River Water Conservation District v. United States · 424 U.S. 800 (1976)
• Williams v. Lee · 358 U.S. 217 (1959)
• Fisher v. District Court of the Sixteenth Judicial District of Montana · 424 U.S. 382 (1976)
• Merrion v. Jicarilla Apache Tribe · 455 U.S. 130 (1982)
• Woods v. Interstate Realty Co. · 337 U.S. 535 (1949)
• Juidice v. Vail · 430 U.S. 327 (1977)
• United States v. Wheeler · 435 U.S. 313 (1978)
• United States v. Mazurie · 419 U.S. 544 (1975)
• Montana v. United States · 450 U.S. 544 (1981)
• County of Allegheny v. Frank Mashuda Co. · 360 U.S. 185 (1959)
• White Mountain Apache Tribe v. Bracker · 448 U.S. 136 (1980)
• Washington v. Confederated Tribes of the Colville Indian Reservation · 447 U.S. 134 (1980)
• Oliphant v. Suquamish Indian Tribe · 435 U.S. 191 (1978)
• Three Affiliated Tribes of the Fort Berthold Reservation v. Wold Engineering, P. C. · 476 U.S. 877 (1986)
• Kennerly v. District Court of the Ninth Judicial District of Montana · 400 U.S. 423 (1971)

Cited by

Later Supreme Court opinions in our collection that cite this case.

• Strate v. A-1 Contractors · 520 U.S. 438 (1997)
• Nevada v. Hicks · 533 U.S. 353 (2001)
• BRENDALE v. CONFEDERATED TRIBES AND BANDS OF THE YAKIMA INDIAN NATION Et Al. · 492 U.S. 408 (1989)
• Michigan v. Bay Mills Indian Community · 572 U.S. 782 (2014)
• El Paso Natural Gas Co. v. Neztsosie · 526 U.S. 473 (1999)
• Carlsbad Technology, Inc. v. HIF Bio, Inc. · 556 U.S. 635 (2009)
• Granberry v. Greer · 481 U.S. 129 (1987)
• Plains Commerce Bank v. Long Family Land & Cattle Co. · 554 U.S. 316 (2008)

Official text

Read the official opinion (U.S. Reports, govinfo.gov)

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Source: the U.S. Reports via govinfo.gov; authoring Justice and vote lineup from the Supreme Court Database (Washington University). Citation count from the Free Law Project’s CourtListener bulk data. Data last verified 2026-07-03. Informational only; verify against the primary source before relying. Not a consumer report (FCRA).