For residents of Missouri looking for 18+ casinos, the options are limited. Missouri state gambling laws permit 21+ players at land based casinos, whilst there are online options that have a minimum age of 18+.
Here is a list of casinos in Missouri and their minimum gambling age.
| Casino | Address | Legal Age |
| Ameristar Casino Resort Spa St. Charles | 1 Ameristar Blvd, St. Louis, MO 63301 | 21+ |
| Ameristar Kansas City | 3200 North Ameristar Drive, Kansas City, MO 64161 | 21+ |
| Argosy Casino Hotel & Spa | 777 NW Argosy Casino Pkwy, Kansas City, MO 64150 | 21+ |
| Casino KC | 1800 E Front St, Kansas City, MO 64120 | 21+ |
| Century Casino Cape Girardeau | 777 North Main Street, Cape Girardeau, MO 63701 | 21+ |
| Century Casino Caruthersville | 777 E 3rd St, Caruthersville, MO 63830 | 21+ |
| Harrah’s Kansas City | 1 Riverboat Dr, St. Louis, MO 64116 | 21+ |
| Hollywood Casino St. Louis | 777 Casino Center Dr, St. Louis, MO 63043 | 21+ |
| Isle of Capri Boonville | 100 Isle of Capri Blvd, Boonville, MO 65233 | 21+ |
| Mark Twain Casino | 104 Pierce St, La Grange, MO 63448 | 21+ |
| St. Jo Frontier Casino | 777 Winners Cir, St Joseph, MO 64505 | 21+ |