Winnsboro is a city in and the parish seat of Franklin Parish, Louisiana, United States. As of July 20098, the estimated city population was 4,377. Louisiana Highway 15 passes north-south through Winnsboro and extends northward to Rayville, the seat of neighboring Richland Parish.
Winnsboro is located at 32°9′48″N 91°43′24″W / 32.16333°N 91.72333°W / 32.16333; -91.72333 (32.163412, -91.723293).
According to the United States Census Bureau, the city has a total area of 4.1 square miles (10.7 km²), of which, 4.1 square miles (10.5 km²) of it is land and 0.1 square miles (0.2 km²) of it (1.69%) is water.