Founded in February 6, 1893, Valley County is one of 56 counties in the state of Montana. Historically, Valley County was formed from Dawson County. The city of Glasgow is the county seat. With FIPS code of 105, Valley County has a population of 7,537 and area of 4,921 square miles (12,745 km2).
List of all cities in Valley County, MT alphabetically
| City/Town | Postal Code | Area Code |
| Fort Peck, MT | 59223 | 406 |
| Frazer, MT | 59225 | 406 |
| Glasgow, MT | 59230 | 406 |
| 59231 | 406 | |
| Glentana, MT | 59240 | 406 |
| Hinsdale, MT | 59241 | 406 |
| Larslan, MT | 59244 | 406 |
| Lustre, MT | 59225 | 406 |
| Nashua, MT | 59248 | 406 |
| Opheim, MT | 59250 | 406 |
| Richland, MT | 59260 | 406 |
| Saint Marie, MT | 59230 | 406 |
| 59231 | 406 | |
| Tampico, MT | 59230 | 406 |
| Vandalia, MT | 59273 | 406 |