People in a de facto relationship

18.2% of people in Undullah are in a de facto relationship — well above average, much higher than the typical suburb (12.3%). It ranks 1,903rd of 12,433 suburbs nationally.

Among its neighbours it's higher than Flagstone, Woolooman and Peak Crossing, but lower than Lyons (Qld).

The rate has climbed 18 points since 2016 (0.0% → 18.2%), outpacing the national rise of 2.0 points.