If you have ever searched for a U.S. rule online, you may have found two different answers: one from the federal government and another from a state government.
That does not always mean one of them is wrong. In the United States, more than one level of government can make rules that affect the same person or situation. Federal laws apply nationwide, while state laws generally apply within the state that creates them. Local governments can also have their own rules.
This can feel confusing at first, especially if you are moving to another state, starting a job, renting a home, or learning about the U.S. for the first time.
In this guide, we’ll explain the difference between federal, state, and local laws—and how to find reliable information about the rules that may apply to you.
What Are Federal Laws?
Federal laws are laws made by the national government. They generally apply throughout the United States, although whether a particular law applies to a person or situation depends on its terms.
Congress—the U.S. House of Representatives and the Senate—is responsible for passing federal legislation. A bill generally must pass both chambers before it goes to the president, who may sign it or veto it.
Federal laws cover many areas, including:
- Immigration
- Federal taxes
- Bankruptcy
- National defense
- Certain workplace protections
- Some matters involving trade between states
Federal agencies may also issue regulations under authority given to them by law. Regulations provide rules for putting laws into practice, but they must remain within the authority granted to the agency.
For an official overview, see USA.gov’s guide to federal laws and regulations.
What Are State Laws?
State laws are laws created by individual state governments. Each of the 50 states has its own legislature, and state laws generally apply within that state.
State laws affect many parts of everyday life. Depending on the subject, they may cover:
- Driver’s licenses and traffic rules
- Family law, including marriage and divorce
- Education requirements
- Many criminal offenses
- Housing and rental matters
- State taxes
The rules are not necessarily identical from one state to another. For example, a requirement that applies to renters or drivers in one state may be different in another.
That is why an article about “U.S. law” may not give you the complete answer to a state-specific question. You may also need to check your state’s official laws or agency guidance.
What Are Local Laws?
Local laws, often called ordinances, are rules made by local governments such as cities, towns, or counties. The authority of a local government depends on the laws of its state.
Local rules can affect things such as:
- Parking
- Building permits
- Zoning and property use
- Noise restrictions
- Certain business permits
- Waste collection
For example, two cities in the same state may have different parking rules. A business may also need to follow federal and state requirements as well as obtain local permits.
The best place to check a local rule is usually the official website of the relevant city, county, or local agency.
Federal vs. State Laws: The Main Differences
The following table provides a simple comparison:
| Question | Federal law | State law |
|---|---|---|
| Who makes it? | Federal legislation is passed by Congress | State legislation is passed by a state legislature |
| Where does it generally apply? | Throughout the United States | Within the state that enacted it |
| Examples of areas | Immigration, federal taxation, bankruptcy | Driver licensing, family law, many housing matters |
| Where can you research it? | Congress.gov and relevant federal agencies | The state legislature and relevant state agencies |
This table is a starting point, not a complete description. Some subjects are governed by both federal and state rules, and the rules may interact.
Can Federal and State Laws Apply to the Same Issue?
Yes. In many situations, federal and state laws both matter.
Take employment as an example. A worker’s situation may involve federal workplace protections as well as state or local protections. Which rules apply depends on the law, the employer, the worker, and the facts.
Another example is taxation. A person may have federal income tax obligations and may also need to consider state or local tax requirements.
The important takeaway is that finding one rule does not always mean your research is complete. You may need to check more than one level of government.
What Happens When Federal and State Laws Conflict?
The U.S. Constitution includes a principle known as the Supremacy Clause. When a valid federal law conflicts with a state law, federal law can take priority. This is often called federal preemption.
However, it is not safe to assume that every difference between state and federal rules is a conflict. Sometimes both can apply, or federal law may allow states to provide additional protections.
Whether a state rule is preempted can be a complicated legal question. The answer depends on the specific laws, the facts, and how courts interpret them.
If you are dealing with a real dispute or an important legal decision, speak with a qualified attorney rather than relying on a general article.
How Do Federal and State Courts Differ?
The United States has separate federal and state court systems. Each system hears certain types of cases, and in some situations their responsibilities can overlap.
Federal Courts
Federal courts can hear cases involving matters such as federal laws, the U.S. Constitution, and bankruptcy. They can also hear certain disputes involving parties from different states when legal requirements are met.
The U.S. Supreme Court is the highest court in the federal judicial system.
State Courts
State courts handle many cases involving state law. Common examples include many family law cases, probate matters, contract disputes, and criminal cases.
However, the dividing line is not always simple. State courts can also consider federal legal issues in appropriate cases, and the court that can hear a particular matter depends on jurisdiction and other rules.
For a detailed comparison, visit U.S. Courts: Comparing Federal and State Courts.
How Do These Laws Affect Everyday Life?
It helps to look at a few practical examples.
Driving
Driver licensing and many traffic rules are handled at the state level. Local governments may also set rules for parking and certain road use.
If you move to another state, check that state’s motor vehicle agency for its licensing requirements.
Renting a Home
A rental situation may involve state landlord-tenant laws, local housing rules, and applicable federal protections.
Before signing a lease, read it carefully and check the rules for the property’s location. A general guide written for another state may not reflect your rights or responsibilities.
Working for an Employer
Workplace rules can come from federal, state, and local laws. For example, minimum wage rates may differ by location. Coverage and exceptions can also depend on the worker and type of job.
USA.gov’s minimum wage guide provides an introduction and links to state information.
Paying Taxes
Federal taxes are separate from state and local taxes. Depending on where you live and work, you may need to consider more than one set of tax rules.
For an introduction to federal taxes, read our article: How U.S. Federal Income Tax Works: A Beginner’s Guide.
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How to Find Federal, State, and Local Laws
When researching a rule, start by identifying where you are and which level of government may be involved.
1. Check Official Federal Sources
For federal legislation, Congress.gov is a useful research starting point. You can also visit the federal agency responsible for the subject.
For a general introduction, use USA.gov’s federal laws and regulations page.
2. Visit Your State Government Website
For state rules, look for your state legislature, court system, or the agency responsible for the issue. For example, a state tax agency is a better source for state tax questions than a general article about federal taxes.
3. Check Your City or County Website
For local matters such as parking, permits, or zoning, search the official website of the city or county involved.
4. Check the Date and Details
Laws and regulations can change. Make sure the information is current and applies to your location and situation. Also check whether you are reading an existing law, a proposed bill, or an agency explanation—these are not the same thing.
Common Mistakes to Avoid
Assuming Every State Has the Same Rules
A rule you learned about in one state may not apply in another. Always confirm the state and local requirements.
Assuming Federal Law Is the Only Law That Matters
Federal law is important, but state and local laws can also affect the same issue. Depending on the situation, you may need to follow requirements from multiple levels of government.
Treating a Proposed Bill as an Existing Law
A bill is a proposal. It does not become law simply because it was introduced. Check its current status before relying on it.
Relying Only on Social Media
A post or short video may leave out exceptions, dates, or location-specific details. Use it as a starting point if helpful, but verify important claims through official sources.
Frequently Asked Questions
Are federal laws the same in every state?
Federal laws generally apply throughout the United States, but whether a particular federal law applies depends on its terms and the situation. State and local laws can also differ by location.
Can a state have a law different from a federal law?
Yes. State and federal rules can differ, and sometimes both apply. If a valid federal law conflicts with a state law, federal law may preempt the state rule, depending on the circumstances.
What is the difference between a state law and a local ordinance?
A state law is created at the state level. A local ordinance is created by a local government, such as a city or county, under authority provided by the state.
Do state courts only hear state law cases?
No. State courts hear many state-law cases, but they may also consider federal legal issues in appropriate cases. The correct court depends on jurisdiction and other legal rules.
Where can I find official U.S. laws?
For federal legislation, start with Congress.gov or USA.gov. For state and local rules, check the relevant state legislature, government agency, city, or county website.
Final Thoughts
The difference between federal and state laws becomes easier to understand when you think about who makes the rule and where it applies.
Federal laws operate nationwide, state laws generally apply within their state, and local ordinances deal with matters within a city, town, or county. Sometimes more than one level of law applies to the same issue.
When researching a specific question, check official sources for your location and review the details carefully. A little extra research can help you avoid relying on information that is outdated or intended for another state.
This article is for general educational purposes and is not legal, tax, or financial advice. Laws and requirements can change, and their application depends on the facts. Consult the relevant government agency or a qualified attorney for guidance about your situation.