High Quality Content by WIKIPEDIA articles! U.S. Route 71 (US 71) is a major north–south U.S. Highway that runs from Louisiana to Canada. US 71 enters Missouri from Arkansas in the town of Jane. US 71 serves the cities of Joplin, Kansas City and St. Joseph. At noon on December 12, 2012, the section of US 71 between Pineville, Missouri and Bannister Road in south Kansas City was also designated as a northern extension of Interstate 49 (I-49).