Whether state laws apply on federal land depends on which of four jurisdiction types the federal government holds over that specific parcel. On some federal property, state law barely reaches at all. On other federal property, state law applies almost as fully as it would on your own front lawn. And on much of it, both federal and state law apply at the same time. The General Services Administration recognizes four categories: exclusive, concurrent, partial, and proprietary.1General Services Administration. Federal Facilities Jurisdictional Status Knowing which one covers the ground under your feet is the difference between breaking a law you thought didn’t apply and relying on a protection you thought you had.
Federal law does not force the government to take exclusive control when it acquires land. Under 40 U.S.C. § 3112, an agency head may accept all, some, or none of the state’s jurisdiction, so new federal ownership does not automatically wipe state law off the property.2GovInfo. 40 USC 3112 – Federal Jurisdiction
Exclusive Jurisdiction: State Law Mostly Steps Aside
Exclusive federal jurisdiction is the setting where state law has the least reach. Congress draws this power from the Enclave Clause, which authorizes it to “exercise exclusive Legislation” over land purchased with state consent for federal purposes such as forts and arsenals.3Congress.gov. Constitution Annotated – Article I Section 8 Clause 17 Military installations, federal prisons, and some national parks like Yellowstone and Yosemite fall here.
On this land, only federal laws and regulations carry force. Crimes are federal matters prosecuted in federal court. State police generally cannot arrest for state-law violations there, and state regulatory agencies have no enforcement authority. The state does keep the right to serve legal process for activities that happened outside the federal parcel.1General Services Administration. Federal Facilities Jurisdictional Status
A quirk that catches people out: state laws on the books at the moment the state transferred jurisdiction remain in effect on the enclave unless Congress says otherwise. State laws enacted after that date generally do not apply. A state statute passed in 2025 would not reach a military base that became an exclusive enclave in 1940, unless the state expressly reserved that power when it ceded the land or Congress specifically authorized the newer law to apply.
Concurrent and Partial Jurisdiction: Both Sets of Rules Apply
Under concurrent jurisdiction, federal and state law apply at the same time. A single act can violate both codes, and either government can prosecute. Federal agents and state or local police both have authority to respond, investigate, and arrest.
Partial jurisdiction works the same way but is less symmetrical. When the state transferred the land, it kept specific powers for itself. A state might have retained authority over fish and wildlife while ceding criminal jurisdiction to the federal government. The exact mix depends on the terms of the original transfer, which is why two parcels in the same county can operate under different rules.
Many national park units run on concurrent or partial jurisdiction. Inside those parks, state DUI statutes, state assault laws, and state environmental regulations can apply alongside the federal rules posted at the entrance, and state courts and federal courts may both be able to hear the resulting cases.
Proprietary Jurisdiction: State Law Applies Broadly
Proprietary jurisdiction covers the largest share of federal land, and it is the category most people don’t know exists. Here the federal government owns the property but has not obtained legislative authority from the state. State law applies broadly, much as it would on private land, and the federal government’s authority is limited to whatever federal statutes grant on their own terms.
Most Bureau of Land Management acreage and many national forests sit in this bucket. Hiking on BLM land in a western state, you are generally subject to state criminal law, state hunting regulations, and state environmental rules. Federal BLM-specific regulations apply too, but they layer on top of state law rather than replacing it. State game wardens can enforce hunting rules, state troopers can enforce traffic laws, and state courts handle most civil disputes.
Federal Law Applies Everywhere on Federal Land
Whatever the jurisdiction type, federal law always applies on federal property. The Supremacy Clause makes federal law the “supreme Law of the Land,” overriding conflicting state law.4Congress.gov. Constitution Annotated – Article VI – Supremacy Clause The Property Clause gives Congress power to regulate federal property that the Supreme Court has described as “plenary and without limitations.”5Congress.gov. Constitution Annotated – Property Clause Generally
Agencies like the National Park Service and the Bureau of Land Management issue regulations that carry the force of law on the land they manage. Violating NPS regulations can result in fines, imprisonment, or both.6National Park Service. Laws, Policies and Regulations Those rules apply whether the jurisdiction is exclusive, concurrent, partial, or proprietary. Even on BLM land where state law broadly applies, you still have to comply with BLM-specific rules about off-road vehicles, grazing permits, and mining claims. When federal and state laws directly conflict, the federal law wins, but the two often address different aspects of conduct and coexist without friction.
The Assimilative Crimes Act
Federal criminal law doesn’t cover every possible offense. There is no federal statute for simple assault, reckless driving, or many property crimes. To fill those gaps on land with exclusive or concurrent jurisdiction, the Assimilative Crimes Act lets federal prosecutors charge someone under the surrounding state’s criminal law when no federal law reaches the conduct.7Office of the Law Revision Counsel. 18 USC 13 – Laws of States Adopted for Areas Within Federal Jurisdiction
In practice, a bar fight on a military base without a matching federal assault statute can still be prosecuted as a federal crime borrowing the state’s assault law. The case stays in federal court with a federal judge and federal prosecutor. It is not a state prosecution; it is the federal government using the state’s legal framework.
One wrinkle: federal sentencing guidelines apply to convictions under the Assimilative Crimes Act, not state sentencing rules. Congress amended the law through the Crime Control Act of 1990 to make this clear.8United States Sentencing Commission. Amendment 412 The definition of the crime comes from state law, but the sentence follows federal guidelines, which can produce meaningfully different outcomes than a state court would.
Taxes You Still Owe
Taxation is one area where Congress has deliberately let state authority reach onto federal property. The Buck Act, enacted in 1940, says no one can escape a state sales or use tax just because the transaction happened on federal land. States have “full jurisdiction and power” to collect these taxes within federal areas to the same extent as if the land were not federally owned.9Office of the Law Revision Counsel. 4 USC 105 – State, and So Forth, Taxation Affecting Federal Areas; Sales or Use Tax
The same rule applies to state income taxes under 4 U.S.C. § 106. Working on a military base or in a federal building does not relieve you of state income tax on those wages. Separate provisions in the Servicemembers Civil Relief Act do protect active-duty military from being taxed by a state solely because they are stationed there.
Traffic, Firearms, and Hunting
Inside the National Park System, state traffic and vehicle laws govern unless a specific federal regulation says otherwise. The rule is direct: “Unless specifically addressed by regulations in this chapter, traffic and the use of vehicles within a park area are governed by State law.”10eCFR. 36 CFR 4.2 – State Law Applicable Speeding inside a national park is itself a federal regulatory violation measured by the state’s posted limit.
Firearms take a different route. Since 2010, federal law prohibits the National Park Service from banning firearm possession in park units as long as the person is not otherwise prohibited from having a gun and the possession complies with the law of the state where the park sits.11GovInfo. 54 USC 104906 – Protection of Right of Individuals to Bear Arms Your right to carry in a national park tracks state gun law. That does not mean you can use the firearm however you wish; hunting is prohibited in most park units, and discharging a weapon near trails or developed areas violates separate federal regulations.
Hunting and fishing on other federal land, including national forests and BLM property, generally require a valid state license. Federal managers can close specific areas for safety or conservation reasons, but licensing and season rules come from the state wildlife agency.12eCFR. 43 CFR 24.4 – Resource Management and Public Activities on Federal Lands
Civil Claims, Family Matters, and Employment
Criminal jurisdiction gets most of the attention, but people also slip and fall, get in car accidents, and have employment disputes on federal property. On land under exclusive federal jurisdiction, state tort law from the date the enclave was created generally applies; newer state laws typically do not. A state that expanded its wrongful death protections in 2015 may find those protections do not reach a federal enclave established in 1960. Courts look at whether the relevant state law existed at the time of cession.
Family law is different. States almost always keep authority over divorce, child custody, adoption, and spousal support, even on exclusive-jurisdiction land. Federal courts generally do not have jurisdiction over domestic relations cases, and concurrent jurisdiction agreements typically preserve state court authority over these matters.
Employment law is a patchwork. The Supreme Court has held that state workers’ compensation laws can apply to private contractors operating on federal property, treating those requirements as broadly applicable safety regulations rather than direct interference with federal functions. Other state labor protections, such as wage and hour laws, may not reach workers employed exclusively on certain federal installations. A private employee on a military base can be covered by state workers’ comp but not by the state’s overtime rules.
How to Find Out What Applies to a Specific Parcel
Figuring out the jurisdictional status of a specific piece of federal land is harder than it should be. No single public database maps every federal parcel to its jurisdiction type. The managing agency knows the status of its own property, and you can request that information.
A few practical guidelines help. Assume both federal regulations and state law apply unless you have specific reason to believe otherwise. Most federal land in the western United States, especially BLM and Forest Service acreage, runs on proprietary jurisdiction where state law broadly applies. Military installations and federal buildings are more likely to have exclusive or concurrent jurisdiction. National parks vary unit by unit based on their enabling legislation.
Agency websites for the National Park Service, Bureau of Land Management, and Forest Service publish regulations specific to their managed lands.6National Park Service. Laws, Policies and Regulations Signage at park and installation entrances often notes key rules. Signage won’t tell you whether the state’s concealed-carry law applies or whether you need a state fishing license. For those questions, check both the federal agency’s rules and the state’s, and when in doubt, follow whichever is more restrictive. That approach won’t always be legally necessary, but it keeps you on the right side of both systems.