So you’re in St. Louis, ready to test your luck, but you’re confused about where to go. You drive past a place called “Video Lounge” and another with “Sweepstakes” on the sign, but then you hear about the flashy lights downtown on the river. Here’s the deal: Missouri law draws a hard line between what’s legal and what’s a grey area, and knowing the difference saves you from getting ripped off or, worse, playing on rigged machines.
St. Louis is actually a sleeper hit for gamblers. You have a dense cluster of legitimate casinos packed into a relatively small area, plus easy access to Illinois spots just across the river. But you also have those "convenience" machines in gas stations that might not pay out the way you expect. Let’s break down exactly where you should be putting your money if you want a fair shot at a jackpot.
This is the biggest point of confusion for players new to the area. In Missouri, regulated casinos are licensed by the Missouri Gaming Commission. They operate on water—either on the Mississippi or Missouri rivers—though you’d hardly notice it inside modern facilities that look like any land-based resort. Places like Ameristar or River City are subject to strict state audits. Their slot machines use Random Number Generators (RNGs) tested by third-party labs. If you hit a jackpot, the casino is legally required to pay you.
Then you have the so-called “Video Lous” or “Sweepstakes Cafes.” You’ll spot them in strip malls or gas stations. These machines exist in a legal grey zone. They often classify themselves as “amusement devices” or sweepstakes entries rather than gambling. The payout percentages on these units can be abysmal compared to regulated casino floors—we’re talking potentially 75% or lower Return to Player (RTP) versus the 88-95% you see in proper casinos. Plus, if the machine malfunctions or the business owner refuses to pay a big win, you have almost zero recourse. For serious slot play, stick to the regulated boats.
St. Louis has a surprising number of options within a 30-minute drive. The local market is highly competitive, which is great for players because it forces casinos to offer better games and promotions to get you through the door.
Located in St. Charles, just west of the city, Ameristar is the heavyweight champion of the local scene. It has the largest gaming floor in the state, boasting over 2,000 slot machines. You’ll find everything from classic 3-reel mechanicals to the newest high-denomination video slots. The casino floor is massive, and they have a dedicated high-limit slot room if you’re looking to bet $25 or $100 per spin. It’s a polished experience, resembling a Las Vegas locals' casino more than a regional riverboat.
If you are staying in South County, River City is the most convenient stop. It has a modern, open layout with roughly 1,700 machines. The vibe here is slightly more relaxed than Ameristar but still upscale. They are known for having a solid selection of video poker—something that’s getting harder to find in other venues that fill the floor with penny slots. Look for their Ultimate Fire Link and Lightning Link banks; they tend to get busy on Friday nights.
Right downtown, you have the Casino Queen on the Illinois side of the Mississippi River. Technically, that puts you in East St. Louis, but it’s minutes from the Arch. They recently rebranded to DraftKings at Casino Queen, integrating a massive sportsbook with the casino floor. The slot floor isn’t as large as Ameristar’s, but it’s well-maintained. Being in Illinois, the tax structure is different, which can sometimes lead to slight variations in player rewards programs compared to Missouri properties.
Missouri casinos are required by law to publish their payout percentages, though you usually have to dig through monthly reports to find them. Generally, the competitive nature of the St. Louis market keeps RTP rates respectable. You can expect penny slots to hover around 88-90%, while dollar slots and higher denominations often push 93-95%.
One specific thing to watch for in Missouri casinos is the printed ticket system. When you cash out, you get a TITO (Ticket In, Ticket Out) slip. Don’t lose it. Unlike some digital apps where funds sit in your account, these tickets are essentially cash. Also, be aware of “must-pay” progressives. Locals often scout banks of slot machines with progressive jackpots that haven't hit in a while, although modern RNGs make this strategy less effective than it was in the mechanical reel era.
If you plan on playing slots for more than just a casual 20 minutes, sign up for the player's club immediately. The St. Louis market is aggressive with “new member” promos. You can often find deals like “$20 in free slot play” just for signing up.
At Ameristar and River City (both Caesars Entertainment properties now), you’ll be using the Caesars Rewards card. This is a huge advantage because points you earn in St. Louis can be used in Las Vegas, New Orleans, or Atlantic City. BetMGM runs the loyalty program for the Casino Queen. Both programs generally offer 1 point for every $5 to $10 played on reel slots. Accumulate enough points, and you can get free buffets, hotel stays, or cashback to reduce the house edge slightly.
Right now, real-money online casino gaming isn't legal in Missouri. If you want to play slots on your phone while sitting in your hotel room, you can’t legally access BetMGM or DraftKings Casino apps for real money payouts. However, you can cross the border into Illinois, where online casinos are also currently restricted, or drive to states like Michigan, New Jersey, or Pennsylvania to play legally.
If you are physically in St. Louis, your only online options are social casinos like McLuck or High 5 Casino. These use a “sweepstakes” model where you play with virtual coins. You can’t deposit cash directly, but you can often redeem “Sweepstakes Coins” for cash prizes if you win. It’s a workaround that fills the gap while the state legislature debates real-money iGaming legalization.
| Casino | Location | Approx. Slots | Notable Feature |
|---|---|---|---|
| Ameristar | St. Charles | 2,000+ | Largest floor in Missouri |
| River City | Lemay (South County) | 1,700+ | Great video poker selection |
| Casino Queen | East St. Louis, IL | 800+ | DraftKings Sportsbook |
| Hollywood Casino | Maryland Heights | 1,300+ | Close to airport |
They operate in a grey area. Missouri law bans unregulated slot machines, but some businesses install “gray machines” that look like slots but aren't regulated by the state. There is no oversight ensuring they pay out correctly, and your odds are significantly worse than at a licensed casino.
It is 21 years old for all casinos in Missouri and Illinois. You will need a valid government-issued ID to enter the gaming floor, and security checks them rigorously, especially on busy weekends.
No, Missouri law prohibits casinos from giving away complimentary alcohol. You have to pay for your drinks even while you are actively gambling. Some high-tier loyalty members might get drink vouchers, but there is no widespread free cocktail service like you see in Las Vegas.
Payouts fluctuate monthly, but Ameristar and River City generally offer competitive RTP rates because they fight for the same customer base. Historically, Hollywood Casino in Maryland Heights has also reported strong payout percentages for higher denomination machines.
You can still insert cash directly into most machines. However, many casinos are moving toward ticket-in, ticket-out (TITO) systems where you insert cash, play, and then print a ticket to cash out. Tipping attendants is customary if you hit a large jackpot requiring a hand pay.
