Population
| 1990 population | 2000 population | 2010 population | 2020 population | |
| City of Neillsville | 2,680 | 2,731 | 2,463 | 2,362 |
| Clark County | 31,647 | 33,557 | 34,690 | 34,725 |
| State of Wisconsin | 4,891,769 | 5,363,715 | 5,686,986 | 5,854,594 |
Source: WI Dept. of Administration & U.S. Census