Louisiana Highway 99 (LA 99) is a state highway located in southwestern Louisiana. It runs 32.44 miles (52.21 km) in a north–south direction from LA 14 west of Lake Arthur to U.S. Highway 190 (US 190) east of Kinder. The highway bisects the sparsely populated Jefferson Davis Parish as it zigzags along rural section line roads. Roughly halfway along its route, LA 99 passes through the town of Welsh and an interchange with Interstate 10 (I-10), the region's main east–west highway. It also intersects US 90, an older parallel corridor that now acts largely as a business route in the area.