The size of Birkenhead is approximately 1 square kilometres. It has 1 park covering nearly 2.2% of total area. The population of Birkenhead in 2011 was 1,716 people. By 2016 the population was 1,656 showing a population decline of 3.5% in the area during that time. The predominant age group in Birkenhead is 50-59 years. Households in Birkenhead are primarily childless couples and are likely to be repaying $1400 - $1799 per month on mortgage repayments. In general, people in Birkenhead work in a professional occupation. In 2011, 68.7% of the homes in Birkenhead were owner-occupied compared with 71.7% in 2016. Currently the median sales price of houses in the area is $550,000.