How Interstate Compacts Work in US Online Gambling

Online gambling in the United States is regulated mainly at state level.

That creates a simple problem.

A state can legalise online poker, but its licensed sites can normally only serve players physically located inside that state.

For casino games played against the house, this may not matter much.

For poker, it matters a lot.

Poker needs other players.

A small state with a small player pool may struggle to offer enough tables, tournaments, and stake levels.

Interstate gambling compacts solve that problem.

They let participating states combine certain online gambling activity, while each state keeps its own regulator, licences, laws, and enforcement powers.

The easiest way to understand them is this: the player pool is shared, but the legal authority is not.

What Is an Interstate Gambling Compact?

An interstate compact is a formal agreement between two or more states.

States use compacts in many areas of government, not just gambling.

For online gambling, the agreement allows participating jurisdictions to coordinate specific activity across state borders without creating a national gambling regulator.

Each state still controls gambling inside its own borders.

The compact simply creates a legal framework that lets those separate systems interact.

That fits the wider US structure, where online gambling law is determined mainly at state level.

What Does a Gambling Compact Actually Change?

A compact changes one major thing: who players can play against.

Without shared liquidity, players in one state normally compete only with other players inside the same state.

With a compact, eligible players in several participating states can enter the same poker games and tournaments.

The compact does not normally replace:

• state gambling licences;
• state regulators;
• state tax systems;
• state consumer protections;
• state enforcement powers.

It connects selected parts of those systems.

Why Poker Needs Shared Liquidity

Poker is different from most online casino games.

When you play a slot, blackjack game, or roulette table against the operator, the casino does not need thousands of other players online at the same time.

Poker is player against player.

That means the size of the active player pool affects the product directly.

A larger pool can support:

• more active tables;
• more stake levels;
• larger tournaments;
• bigger prize pools;
• shorter waiting times;
• more games running outside peak hours.

This is why interstate compacts have mattered most for online poker.

The Multi-State Internet Gaming Agreement

The main interstate agreement for regulated US online poker is the Multi-State Internet Gaming Agreement, usually called MSIGA.

As of 2026, six states are members:

• Delaware;
• Michigan;
• Nevada;
• New Jersey;
• Pennsylvania;
• West Virginia.

Pennsylvania became the sixth member in April 2025.

Its entry was especially important because Pennsylvania has a much larger population than the earlier member states.

The Pennsylvania Gaming Control Board said the state’s addition expanded the MSIGA market to more than 38 million people.

How the Six-State System Works

The states do not merge into one gambling market.

Instead, they agree that eligible operators can connect players across participating jurisdictions.

A simplified version looks like this:

1. A player opens an account with a licensed operator.
2. The operator verifies the player’s identity.
3. Geolocation confirms which state the player is physically in.
4. The system checks whether the player is eligible under that state’s rules.
5. The player can then enter a shared game with players from other compact states.

The game is shared.

The legal relationship remains state-based.

One Table Can Contain Players Under Different State Regulators

This is the most interesting part of the system.

Imagine a poker table with players located in:

• New Jersey;
• Michigan;
• Nevada;
• Pennsylvania.

They can sit in the same online game.

But each player remains subject to the rules that apply where they are physically located.

The compact does not create a seventh regulator sitting above the states.

It creates rules that allow the separate regulators to cooperate.

What Stays State-Specific?

Even inside a shared network, states keep control over major parts of regulation.

This is why shared liquidity is not the same thing as federal regulation.

Operators Still Need State Approval

Joining MSIGA does not mean one licence suddenly works across every member state.

Operators still need the required approval to serve players in each jurisdiction.

That preserves state control.

A poker network may connect several states technically, but the operator still has to satisfy the regulators responsible for those players.

This creates more work for operators than one national licence would.

It also lets each state retain its own standards.

Geolocation Makes the Compact Possible

Shared liquidity depends heavily on location technology.

The operator needs to know where each player is when they play.

A player registered in Pennsylvania cannot simply travel anywhere in the country and remain automatically eligible.

The system must confirm that the player is inside a jurisdiction where that activity is allowed.

Geolocation can use several signals, depending on the platform and state requirements.

The important point is that the compact connects legal markets.

It does not remove territorial limits.

Why States Join MSIGA

The main reason is scale.

A single state market can be small.

Combining several legal markets gives licensed operators a larger active player base.

That can improve the player experience and make regulated poker more commercially viable.

Pennsylvania’s regulator listed benefits including fuller tables, shorter wait times, larger tournament prize pools, and stronger competition after the state joined MSIGA.

Why Population Matters So Much

Not all member states contribute the same number of potential players.

A state with a large population adds far more possible liquidity than a small state.

This is why Pennsylvania’s 2025 entry mattered.

The PGCB said Pennsylvania increased the shared MSIGA player pool by more than 50%.

That demonstrates an important feature of compact economics: one large state can change the value of the whole network.

Why Not Every Legal Poker State Joins

Legalising online poker does not automatically mean joining an interstate agreement.

A state still has to decide that the compact fits its own laws and regulatory goals.

Possible considerations include:

• whether its laws allow interstate play;
• regulatory compatibility;
• operator requirements;
• tax treatment;
• technical standards;
• political timing.

Participation is voluntary.

A state can operate its own legal online poker market without sharing liquidity.

Interstate Compacts Are Not Federal Gambling Legalisation

This distinction is important.

A federal system would create rules at national level.

An interstate compact does not.

Under the compact model:

• states decide whether to join;
• states keep their own regulators;
• states keep their own licences;
• states keep their own tax systems;
• states retain enforcement authority.

Only selected functions are coordinated.

That makes a compact a form of cooperation inside the existing state-based system.

Compact vs Federal System

How Compacts Compare With Offshore Poker Networks

Offshore poker sites solve the liquidity problem very differently.

An offshore network may accept players from several countries and combine them into one international player pool.

That gives the operator scale without relying on US interstate agreements.

Regulated US operators cannot simply do the same thing.

They operate inside state legal systems.

To combine players across state lines, they need a lawful mechanism allowing those jurisdictions to cooperate.

That is what MSIGA provides.

The difference is therefore not the technology.

Both systems can technically connect players from different places.

The difference is the legal structure behind that connection.

Our guide to offshore casinos explains how offshore operators differ from locally regulated platforms.

Why Compacts Help Regulated Markets Compete

Online poker has strong network effects.

Players generally prefer networks where:

• games run more often;
• more stake levels are available;
• tournaments attract more entries;
• prize pools are larger.

A small isolated regulated market can struggle against a larger offshore network.

Compacts let regulated operators gain some of the same scale while keeping state licensing and oversight.

This is one of the most important economic reasons for shared liquidity.

What Shared Liquidity Changes for Players

From the player’s point of view, very little about the account process needs to change.

Players still:

1. join a licensed operator;
2. verify their identity;
3. pass location checks;
4. play under the rules of the state where they are located.

The main difference appears after they enter the poker network.

They can be matched with players in other participating states.

That can create:

• more active tables;
• larger tournaments;
• more stake options;
• shorter waits for games.

Who Handles a Player Dispute?

Shared games do not mean players lose their local regulatory protections.

The relevant state regulator still oversees the operator’s activity within that jurisdiction.

Gambling regulators can also cooperate where a problem involves shared interstate activity.

The compact makes cooperation possible without replacing the individual regulators.

What Interstate Compacts Show About US Gambling Law

MSIGA demonstrates something important about the wider US system.

State regulation does not necessarily mean every market has to remain isolated.

States can keep their independence while coordinating where cooperation is useful.

That produces a system with two layers:

1. local regulation: each state controls gambling inside its own borders;
2. interstate cooperation: member states agree to share selected parts of the market.

The second layer does not replace the first.

It sits on top of it.

The Simple Way to Understand MSIGA

There are four things to remember.

1. States remain in control. MSIGA does not create a national regulator.
2. Player liquidity can be shared. Eligible players in member states can enter the same poker network.
3. Operators still need approval. Shared liquidity does not create one universal licence.
4. Player location still matters. Geolocation determines which state’s rules apply.

Those four points explain most of the system.

Conclusion

Interstate gambling compacts solve a problem created by state-based online gambling regulation.

Poker benefits from large player pools.

State gambling law creates geographic borders around those pools.

MSIGA lets states connect them without giving up control.

As of 2026, Delaware, Michigan, Nevada, New Jersey, Pennsylvania, and West Virginia are members of the agreement.

Players in participating markets can join shared poker networks, while the states continue to control licensing, taxation, consumer protection, and enforcement.

That makes interstate compacts neither a national gambling system nor an exception to state regulation.

They are a way for separate state markets to cooperate.

The simplest description is still the best: the states share liquidity, not sovereignty.