The size of Glen Allyn is approximately 40.5 square kilometres. It has 1 park. The population of Glen Allyn in 2016 was 157 people. By 2021 the population was 109 showing a population decline of 30.6% in the area during that time. The predominant age group in Glen Allyn is 60-69 years. Households in Glen Allyn are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Glen Allyn work in a managers occupation.In 2021, 64.30% of the homes in Glen Allyn were owner-occupied compared with 66.70% in 2016.
Glen Allyn has 76 properties. Over the last 5 years, Houses in Glen Allyn have seen a 76.56% increase in median value. As at 31 October 2025:
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