42% of Victoria's homeless cite Family Violence as the main reason

Domestic and family violence is an increasingly common reason for seeking homelessness services. The AIHW [Australian Institute of Health and Welfare] found that 106,000, or 38% of people requiring services, sought support due to domestic and family violence in 2015-16. This was a 33% increase from 2011–12, when the collection began, and a 14% increase from 2014–15.
Domestic and family violence was the most common reason for accessing services in Victoria, the Northern Territory and Western Australia. The latter had the highest rate (43%), while the Northern Territory and Victoria came close behind with 40% and 42% respectively. Nationally, 35% of people access homelessness services for this reason.

These two paragraphs are extracted from an article written by Anna Livsey entitled 'Homeless in Australia: the shifting numbers and definitions' published here.