Minnesota
With the exception of Highway 121, these highways were built to serve state institutions such as prisons or state hospitals from an adjacent trunk highway.
- Minnesota State Highway 121
- Minnesota State Highway 289
- Minnesota State Highway 290
- Minnesota State Highway 292
- Minnesota State Highway 297
- Minnesota State Highway 299
- Minnesota State Highway 309
- Minnesota State Highway 333
Read more about this topic: List Of State Highways In The United States Shorter Than One Mile