Interstate 35W (abbreviated I-35W), an interstate highway, is the western half of Interstate 35 where it splits to serve different cities in Minnesota. I-35 splits into two branch routes, I-35W and I-35E at Burnsville. I-35W runs north for 39 miles (63 km), carrying its own separate sequence of exit numbers. It runs through Minneapolis before rejoining with I-35E to reform I-35 in Columbus Township. I-35W supplanted the now-decommissioned highways of old US 8 north of Minneapolis and US 65 south of the city.
Historically, other interstates were given directional suffixes. On every other interstate, the directional suffixes were phased out by giving the route a loop or spur designation. In the case of I-35, since both branches return to a unified interstate beyond the twin cities of St. Paul and Minneapolis, the AASHTO committees allowed the suffixes to remain.