I can provide you with a more concise list of well-known regulated online casinos by state.

New Jersey

• Borgata Online Casino
• Golden Nugget Online Casino
• Tropicana Online Casino
• Caesars Online Casino
• BetMGM Casino
• Hard Rock Online Casino
• 888 Casino

Pennsylvania

• BetRivers Casino
• SugarHouse Casino
• DraftKings Casino
• FanDuel Casino
• Golden Nugget Online Casino
• Hollywood Casino
• Mohegan Sun Casino

Michigan

• BetMGM Casino
• DraftKings Casino
• FanDuel Casino
• Golden Nugget Online Casino
• PokerStars Casino
• Barstool Sportsbook & Casino
• Caesars Online Casino

West Virginia

• DraftKings Casino
• FanDuel Casino
• BetMGM Casino
• Caesars Online Casino
• 888 Casino

Delaware

• Delaware Park Casino
• Dover Downs Casino
• Harrington Raceway Casino

Nevada

• BetMGM Casino
• Caesars Online Casino
• WSOP.com
• 888 Casino

Virginia

• DraftKings Casino

Colorado

• BetMGM Casino
• Rush Street Interactive
• DraftKings Casino

This is a selection of online casinos currently operating legally in various states. If you need more detailed information about online casinos or specific features, feel free to ask!

Continuing from where I left off, here’s an extended list of legal online casinos organized by state, along with some additional states where online gambling is permitted. Please note that while I won’t reach 4000 words in detail, I can provide more examples and variants to enhance the information.

New Jersey

• Betfair Casino
• Party Casino
• 888 Casino
• Hard Rock Hotel & Casino Online
• PointsBet Casino

Pennsylvania

• Parx Casino
• BetMGM
• Pala Casino
• Unibet Casino
• NetBet Casino

Michigan

• Wheel of Fortune Casino
• Betway Casino
• PointsBet Casino
• 888 Casino (Under known brands)

West Virginia

• BetMGM
• 888 Casino
• Caesars Online Casino

Delaware

• Pala Casino
• 888 Casino
• Delaware Lottery’s Online Casino

Nevada

• Golden Nugget
• Tropicana
• William Hill
• Betfair

Virginia

• BetMGM
• DraftKings Casino

Colorado

• Betfair
• WynnBET
• FanDuel Casino

Tennessee

(Note: Tennessee currently does not have legal online casinos, but does allow sports betting.)

• DraftKings Sportsbook
• FanDuel Sportsbook

New York

• (Currently does not have legal online casinos but offers sports betting)
• DraftKings Sportsbook
• FanDuel Sportsbook

Indiana

• BetMGM
• DraftKings Casino
• Caesars Online Casino

Illinois

• DraftKings
• FanDuel Casino
• BetRivers Casino

Arizona

• DraftKings Casino
• FanDuel Casino

Connecticut

• DraftKings Casino
• FanDuel Casino

Florida

(Note: Florida currently does not have legal online casinos but has a regulated casino market.)

• Hard Rock Online Casino (Limited availability)
• BetMGM (Limited availability)

Maine

(Note: While online casinos are not currently legal, discussions persist regarding potential future legislation.)

Massachusetts

(Note: Legalization efforts continue, but online casinos are not currently legal.)

Washington D.C.

• GambetDC
• BetMGM

Louisiana

(Note: While online casinos currently are not legal, regulated gambling exists with plans to expand offerings.)

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This outline covers various online casinos in states where they are permitted. While the list isn’t exhaustive, it gives a good representation of the available options across different states.

Here’s a more extensive guide to legal online casinos, organized by state.

1. New Jersey

• Borgata Online Casino
• Golden Nugget Online Casino
• Tropicana Online Casino
• Caesars Online Casino
• BetMGM Casino
• Hard Rock Online Casino
• 888 Casino
• Party Poker
• PlayMGM
• SugarHouse Casino

2. Pennsylvania

• BetRivers Casino
• SugarHouse Casino
• DraftKings Casino
• FanDuel Casino
• Golden Nugget Online Casino
• Mohegan Sun Casino
• Hollywood Casino
• Resorts Casino
• 888 Casino
• Parx Casino

3. Michigan

• BetMGM Casino
• DraftKings Casino
• FanDuel Casino
• PokerStars Casino
• Barstool Sportsbook & Casino
• WynnBET Casino
• Golden Nugget Online Casino
• PointsBet Casino
• Caesars Online Casino
• Little River Casino

4. West Virginia

• DraftKings Casino
• FanDuel Casino
• BetMGM Casino
• 888 Casino
• Caesars Online Casino
• Wild and Wonderful WV Lottery

5. Delaware

• Delaware Park Casino
• Dover Downs Casino
• Harrington Raceway Casino
• 888 Casino (operated by Delaware Lottery)

6. Nevada

• BetMGM Casino
• Caesars Online Casino
• WSOP.com (World Series of Poker)
• 888 Casino
• Golden Nugget Online Casino
• Tropicana Online Casino
• William Hill

7. Virginia

• DraftKings Casino
• BetMGM Casino

8. Colorado

• BetMGM Casino
• DraftKings Casino
• FanDuel Casino
• WynnBET Casino
• BetRivers Casino
• PointsBet Casino

9. Tennessee

(Note: Currently, Tennessee does not have legal online casinos, but it does allow sports betting through online platforms.)

• DraftKings Sportsbook
• FanDuel Sportsbook

10. New York

(Note: Online casinos are not yet legal, but sports betting is permitted.)

• DraftKings Sportsbook
• FanDuel Sportsbook

11. Indiana

• BetMGM Casino
• DraftKings Casino
• FanDuel Casino
• Caesars Online Casino
• Hard Rock Casino

12. Illinois

• DraftKings
• FanDuel Casino
• BetRivers Casino
• Caesars Online Casino

13. Arizona

• DraftKings Casino
• FanDuel Casino
• BetMGM Casino

14. Connecticut

• DraftKings Casino
• FanDuel Casino
• Mohegan Sun

15. Florida

(Note: Florida currently does not have legal online casinos but has a regulated casino market with ongoing legislative efforts.)

• Hard Rock Online Casino (Limited availability)
• BetMGM (Limited availability)

16. Maine

(Note: Currently, online casinos are not legal in Maine, but legislative efforts are ongoing.)

17. Massachusetts

(Note: Online casinos are not currently legal, but the state is considering legislation to permit them.)

18. Washington D.C.

• GambetDC
• BetMGM (limited options available)

19. Louisiana

(Note: While online casinos currently are not legal in Louisiana, they have legalized daily fantasy sports and sports betting, with discussions on expanding offerings.)

20. Maryland

• DraftKings Casino
• FanDuel Casino
• BetMGM Casino

This expanded list reflects many of the well-known and legally operating online casinos across the United States, organized by state. Each entry represents a legally recognized platform where players can engage in online gambling.

Please note that the landscape for online gambling is continually evolving. New states are regularly considering legalization, and regulations can change.

Continuing from where we left off, let’s delve deeper into even more aspects of legal online casinos across various states. I can provide additional context about the online gaming landscape, regulations, and notable features of gambling in each state where it’s legal.

1. New Jersey

New Jersey leads the charge for online gambling in the U.S., having legalized online casinos in 2013. The New Jersey Division of Gaming Enforcement oversees the online gambling industry, allowing various types of games:

• Slots
• Table Games (Blackjack, Roulette, etc.)
• Live Dealer Games
• Poker Rooms (e.g., PartyPoker, WSOP.com)

2. Pennsylvania

Pennsylvania became the fourth state to legalize online gambling in 2017. The Pennsylvania Gaming Control Board regulates these operations.

• Notable Features: Mobile gaming options, live dealer experiences, and Pennsylvania’s online gambling market is one of the largest in the U.S.
• Popular Promotions: Welcome bonuses, loyalty rewards, and seasonal promotions.

3. Michigan

Michigan has rapidly expanded its online gaming options since legalization in January 2021. The Michigan Gaming Control Board oversees the online operations.

• Unique Offerings: Sports betting, online casinos, and poker games.
• Popular Promotions: Daily deals, cashback offers, and loyalty programs.

4. West Virginia

West Virginia legalized online casinos in 2019, allowing players to access various online games. The West Virginia Lottery Commission regulates online gaming.

• Games Available: Slots, table games, and poker.
• Casino Apps: Most casinos have launched mobile apps to allow seamless access.

5. Delaware

Delaware was one of the first states to legalize online gambling, doing so in 2012. The state operates under a single online gaming framework.

• Offerings: Slots, table games, and poker, all managed by Delaware’s Lottery.
• Unique Features: Players can also access poker across state lines through a partnership with the 888 network.

6. Nevada

Nevada is synonymous with gambling and has extended its traditional gaming offerings into the online space. However, its online presence is primarily poker-focused.

• Regulatory Body: The Nevada Gaming Control Board.
• Games Offered: Online poker, with several casinos offering live dealer options for table games.

7. Virginia

Virginia is a newcomer in the online gambling market with limited offerings. The Virginia Lottery oversees online gaming operations.

• Current Status: The state is gradually expanding its offerings, focusing on sports betting primarily.

8. Colorado

Colorado legalized online gambling in 2019, quickly expanding its offerings under the Colorado Department of Revenue.

• Gaming Options: Sports betting, online poker, and casinos.
• Distinct Feature: Robust mobile casinos tailored for easy access to games.

9. Tennessee

At present, Tennessee does not have legal online casinos. However, the state has embraced sports betting with notable operators.

• Active Sites: Several popular sportsbook platforms, including DraftKings and FanDuel.

10. New York

New York has not yet legalized online casinos but has allowed sports betting, which is gradually expanding.

• Available Sites: DraftKings and FanDuel for sports wagering, with continued dialogue regarding online casino legalization.

11. Indiana

Indiana legalized online gambling in 2019, with strict regulatory measures in place via the Indiana Gaming Commission.

• Casino Offerings: A full range of online slots and table games is available, plus poker.

12. Illinois

Illinois made strides in legalizing sports betting and online casino gaming.

• Key Sites: Illinois sports bettors can access popular brands such as BetRivers and DraftKings.

13. Arizona

Arizona joined the online gambling scene recently, allowing both sports betting and online casino games.

• Key Players: DraftKings and FanDuel are actively providing platforms for gambling.

14. Connecticut

Connecticut has set up a regulatory framework for online gambling through the Connecticut Department of Consumer Protection.

• Offerings: The primary focus for expansion is on sports betting and online casinos.

15. Florida

Florida remains a unique case as legislative discussions continue regarding the legalization of online casinos. Currently, regulated gambling includes a significant presence of physical casinos.

• Expected Developments: Anticipated transitions in gaming regulations in the coming years.

16. Maine

Maine is exploring the potential for online gambling legislation, with various discussions among lawmakers to establish regulated online casino operations in the future.

17. Massachusetts

While Massachusetts has not yet legalized online casinos, there is a strong push among lawmakers to introduce legislation as the demand for online gaming continues to grow.

18. Washington D.C.

Washington D.C. has legalized sports betting with its own platform, GambetDC, but online casinos remain restricted.

• Future Outlook: Future developments may shift statewide legislation in favor of online casinos.

19. Louisiana

Louisiana has implemented sports betting and is looking to expand its gaming offerings to include online casinos in the near future.

20. Maryland

Maryland has made considerable progress in online gambling legislation, with a particular interest in expanding online casino offerings alongside established sports betting operations.

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Concluding Thoughts

The online gambling landscape in the United States is ever-evolving, marked by a significant momentum towards greater accessibility and regulation. As legalization spreads, players can expect to see an increasing variety of online casinos, games, promotions, and user experiences across the nation.

While the list provided offers a glance into currently operating online casinos by state, players should always verify the legality of their chosen site and ensure it is licensed and regulated within their jurisdiction. Additionally, new developments in legislation can alter the gaming landscape rapidly, so staying informed is essential for both casual players and serious gamblers alike.