| Type: | town |
| Kynnumboon | |
| State: | nsw |
| Coordinates: | -28.3147°N 153.3839°W |
| Pop: | 109 |
| Postcode: | 2484 |
| Lga: | Tweed Shire |
| Stategov: | Tweed |
| Fedgov: | Richmond |
Kynnumboon is a locality in the Tweed Shire of New South Wales, Australia.[1] It had a population of 109 as of the .
As of the 2021 Australian census, 109 people resided in Kynnumboon, down from 134 in the . 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.