Mississippi State Route 309 runs north-south in Western Marshall County. It runs from Mississippi State Route 4, near Independence, to the Mississippi/Tennessee State Line. MS St Rt 309 passes through the following town in Marshall County. Byhalia MS St Rt 309 is not multi-plexed in Marshall County. MS St Rt 309 intersects the following highways in Marshall County. Mississippi State Route 4, near Independence. Future Interstate 22, near Byhalia. U.S. Rt. 78, near Byhalia. Mississippi State Route 178, at Byhalia. Mississippi State Route 302, near Olive Branch.
A BGS on WB U.S. Rt. 78. A junction marker on EB MS St Rt 302.
