Tampico is an unincorporated community and ghost town in Valley County, Montana, United States, located between Glasgow and Hinsdale. It was originally founded as a stopping point to provide water for steam locomotives on the Great Northern Railway. Coinciding with the Enlarged Homestead Act of 1909, the town became a minor hub for local agriculture. The town also housed workers for the 1917 construction of the Vandalia Diversion Dam which was used for irrigation from the Milk River.