Coalgate had a population of 339 at the 2018 New Zealand census, an increase of 24 people (7.6%) since the 2013 census, and an increase of 111 people (48.7%) since the 2006 census.
Coalgate's population in 2018 was 339, demonstrating a rise of 24 individuals (7.6%) compared to the 2013 census and an increase of 111 people (48.7%) from the 2006 census.