North Balgowlah spans an area of approximately 1 km². The population of North Balgowlah as at the 2006 Census was 3,309 people. The age demographic is… 36.3% of the population is aged 24 or under. 43.6% of the population is aged between 25 – 54. 20.1% of the population is aged over 55. The “average” household in North Balgowlah is a couple with children, with a monthly income of $7,650, repaying $2,500 per month on their mortgage. In 2006, 81% of homes in North Balgowlah were owner-occupied.