How are interstate property line disputes handled at the federal level?

What the Law Says

The U.S. Constitution and federal statutes narrowly define when federal courts may hear property boundary disputes between residents of different states.

The U.S. Constitution grants federal courts limited jurisdiction—primarily over cases 'arising under' federal law or involving 'diversity of citizenship' where the parties reside in different states and the amount in controversy exceeds $75,000. Most property line disputes involve state common law, surveying rules, and adverse possession doctrines, which fall outside federal question jurisdiction.

Even with diversity jurisdiction, federal courts apply the substantive law of the state where the land is located under the Erie Doctrine (Erie R.R. Co. v. Tompkins, 304 U.S. 64 (1938)). This means federal judges interpret and enforce state boundary laws—not federal ones.

The Supreme Court retains original jurisdiction over 'controversies between two or more States' under Article III, Section 2—but this applies only when entire states (e.g., Georgia v. Tennessee, 237 U.S. 473 (1915)) assert sovereign claims over territory, not private neighbor disputes across state lines.

Statutory Text

The judicial Power shall extend to all Cases...between Citizens of different States;

— U.S. Const. art. III, § 2

Statutory Text

The district courts shall have original jurisdiction of all civil actions where the matter in controversy exceeds the sum or value of $75,000...

— 28 U.S.C. § 1332(a)(1)

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