In the U.S. state of Minnesota, a legislative route is a highway number defined by the Minnesota State Legislature. The routes from 1 to 70 are constitutional routes, defined as part of the Babcock Amendment to the Minnesota State Constitution, passed November 2, 1920. All of them were listed in the constitution until a 1974 rewrite. Though they are now listed separately in §161.114 of the Minnesota Statutes, the definitions are legally considered to be part of the constitution, and cannot be altered or removed without an amendment. Legislative routes with numbers greater than 70 can be added or deleted by the legislature.

The Constitution of the State of Minnesota was initially approved by the residents of Minnesota Territory in a special election held on October 13, 1857, and was ratified by the United States Senate on May 11, 1858, marking the admittance of Minnesota to the Union. Nearly 120 amendments have been approved, with perhaps the most significant being a reorganization in 1974 to simplify the document, making it easier for modern readers to comprehend and reducing the extensive verbiage. It is believed that the constitution was amended twice prior to ratification.