Neillsville is a city in Clark County in the U.S. state of Wisconsin. The population was 2,731 at the 2000 census. It is the county seat.
Neillsville is located at 44°33′40″N 90°35′45″W / 44.56111°N 90.59583°W / 44.56111; -90.59583 (44.560996, -90.595746).
According to the United States Census Bureau, the city has a total area of 2.8 square miles (7.3 km²), of which, 2.8 square miles (7.3 km²) of it is land and 0.04 square miles (0.1 km²) of it (1.06%) is water.