Kynnumboon is a locality in the Tweed Shire of New South Wales, Australia. It had a population of 109 as of the 2021 census.

Demographics

As of the 2021 Australian census, 109 people resided in Kynnumboon, down from 134 in the 2016 census. The median age of persons in Kynnumboon was 54 years. There were more males than females, with 51.8% of the population male and 48.2% female. The average household size was 2.5 people per household.