| State: | WY |
| Type: | WY |
| Route: | 340 |
| Map Custom: | yes |
| Map Notes: | WYO 340 highlighted in red |
| Length Mi: | 1.35 |
| Length Round: | 2 |
| Length Ref: | [1] |
| Direction A: | West |
| Terminus A: | west of Story |
| Direction B: | East |
| Terminus B: | in Story |
| Counties: | Sheridan |
| Previous Type: | WY |
| Previous Route: | 339 |
| Next Type: | WY |
| Next Route: | 341 |
Wyoming Highway 340 (WYO 340) is a 1.35-longNaN-long east-west State Road in the U.S. state of Wyoming that runs through the community of Story in southern Sheridan County.
Wyoming Highway 340 travels from Sheridan County Route 2 just west of Story east into the community as North Piney Creek Road. It changes into Crooked Street as it turns southeast in Story and reaches its eastern end at Wyoming Highway 194.[2]