The size of Sadleir is approximately 1 km2. It has 4 parks covering nearly 2% of the total area. There are 3 schools located in Sadleir.

The population of Sadleir in 2001 was 2,963 people. By 2006 the population was 2,830 showing a population decline of 4% in the area during that time.

The predominant age group in Sadleir is 0 - 9 years.

Households in Sadleir are primarily couples with children and are likely to be repaying between $1000.00 - $1200.00 per month on mortgage repayments.

In general, people in Sadleir work in a non-specific occupation.

In 2001, 50% of the homes in Sadleir were owner-occupied compared with 47% in 2006.

Currently the median sale price of houses in the area is $316,000.