In the 2021 Census of Population conducted by Statistics Canada, Fillmore had a population of 282 living in 123 of its 149 total private dwellings, a change of -9.3% from its 2016 population of 311. With a land area of 1.32 km (0.51 sq mi), it had a population density of 213.6/km (553.3/sq mi) in 2021.
In the 2016 Census of Population, the Village of Fillmore recorded a population of 311 living in 129 of its 149 total private dwellings, a 18% change from its 2011 population of 255. With a land area of 1.33 km (0.51 sq mi), it had a population density of 233.8/km (605.6/sq mi) in 2016.
