For residents of South Dakota looking for 18+ casinos, the options are limited. South Dakota 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 South Dakota and their minimum gambling age.
| Casino | Address | Legal Age |
| Best Western Hickok House | 137 Charles St, Deadwood, SD 57732 | 21+ |
| Buffalo Bodega Gaming Complex | 658 Main St, Deadwood, SD 57732 | 21+ |
| Cadillac Jacks Gaming Resort | 360 Main St, Deadwood, SD 57732 | 21+ |
| Dakota Connection Casino Bingo | 46102 SD-10, Sisseton, 57262 | 21+ |
| Dakota Sioux Casino & Hotel | 16415 Sioux Conifer Rd, Watertown, 57201 | 21+ |
| Deadwood Gulch Gaming Resort | 304 Cliff St, Deadwood, SD 57732 | 21+ |
| Deadwood Gulch Saloon | 560 Main St, Deadwood, SD 57732 | 21+ |
| Deadwood Mountain Grand Casino & Hotel | 1906 Deadwood Mountain Drive, Deadwood, SD 57732 | 21+ |
| Deadwood Station Bunkhouse and Gambling House | 68 Main St, Deadwood, SD 57732 | 21+ |
| East Wind Casino | 110 Grandma B Dr, Martin, 57551 | 21+ |
| First Gold Gaming Resort | 270 Main St, Deadwood, SD 57732 | 21+ |
| Fort Randall Casino & Hotel | 7011, 38538 SD-46, Lake Andes, 57356 | 21+ |
| Gold Country Inn Gambling Hall & Café | 801 Main St, Deadwood, SD 57732 | 21+ |
| Gold Dust Casino & Hotel | 688 Main St, Deadwood, SD 57732 | 21+ |
| Golden Buffalo Casino | 321 Sitting Bull St, Lower Brule, 57548 | 21+ |
| Grand River Casino & Resort | 2 US-12, Mobridge, 57601 | 21+ |
| Hickok’s Hotel & Suites | 685 Main St, Deadwood, SD 57732 | 21+ |
| Iron Horse Inn | 27 Deadwood St, Deadwood, SD 57732 | 21+ |
| Lode Star Casino & Hotel | 1003 SD-47, Fort Thompson, 57339 | 21+ |
| Lucky 8 Casino | 196 Cliff St, Deadwood, SD 57732 | 21+ |
| Martin & Mason Hotel (the Wooden Nickel Casino) | 33 Deadwood St, Deadwood, SD 57732 | 21+ |
| Mineral Palace Hotel & Gaming | 601 Historic Main Street, Deadwood, 57732 | 21+ |
| Mustang Sally’s | 634 Main St, Deadwood, SD 57732 | 21+ |
| Oyster Bay Bar & Casino | 628 Main St, Deadwood, SD 57732 | 21+ |
| Prairie Wind Casino & Hotel | 112 Casino Dr, Oglala, SD 57764 | 21+ |
| Royal River Casino & Hotel | 607 S Veterans St, Flandreau, 57028 | 21+ |
| Saloon #10 | 657 Main St, Deadwood, SD 57732 | 21+ |
| Silverado Franklin Historic Hotel & Gaming Complex | 709 Main St, Deadwood, SD 57732 | 21+ |
| The Historic Bullock Hotel | 633 Main St, Deadwood, SD 57732 | 21+ |
| The Lodge at Deadwood Gaming Resort | 100 Pine Crest Lane, Deadwood, SD 57732 | 21+ |
| Time Out Lounge | 615 E North St, Rapid City, 57701 | 21+ |
| Tin Lizzie Gaming Resort | 555 Lower, Main St, Deadwood, SD 57732 | 21+ |
| Turtle Creek Crossing Casino | 28281 US Highway 18, Mission, 57555 | 21+ |