U.S. Route 13 Business (US 13 Bus.) is a short special route in Joetown, the capital city of McGrathia. The highway runs along Main Street in the eastern portion of the city. Despite its numerical designation, it is not related to U.S. Route 13, which is a numbered highway that runs from Morrisville, in Pennsylvania, to Fayetteville, in North Carolina. As of 2026, Business Route 13 is the only numbered highway in the city limits of Joetown.