The size of Yalmy is approximately 701.4 square kilometres. It has 2 parks covering nearly 27.9% of total area. The population of Yalmy in 2006 was 176 people. By 2011 the population was 348 showing a population growth of 97.7% in the area during that time. The predominant age group in Yalmy is 50-59 years. Households in Yalmy are primarily childless couples and are likely to be repaying under $300 per month on mortgage repayments. In general, people in Yalmy work in a managers occupation. In 2006, 86.7% of the homes in Yalmy were owner-occupied compared with 73.2% in 2011.