Harrisville is in meshblocks 0828202 (SE) and 0828302 (NW), which had a combined population of 99 people in the 2018 New Zealand census.

[1] The area was named for an early landowner and politician, Benjamin Harris, and was largely settled by Danes.

[2][3][4] The population decline of Harrisville is evinced by the town going from weekly church services to having none at all in 1914.

[5] Tuakau Rural statistical area, which includes Harrisville and surrounds but does not include Tuakau, covers 43.04 km2 (16.62 sq mi)[6] and had an estimated population of 1,610 as of June 2024,[7] with a population density of 37 people per km2.

Before the 2023 census, the statistical area had a larger boundary, covering 46.00 km2 (17.76 sq mi).