Decades of under-investment in social housing has fuelled an affordability and homelessness crisis in one state and the situation is not improving, data suggests.

Victoria's housing woes have worsened across almost every key measure, according to the Council to Homeless Persons' second housing insecurity index.

Applicants on the state's social housing waiting list, including those seeking transfers, ballooned to 66,117 as of March - up 7.35 per cent year-on-year.

People with priority access due to family violence were still, on average, waiting more than 19 months for public housing, council chief executive Deborah Di Natale said.

"You need to ask yourself what kind of decisions we're forcing women as a primary carer to make," she told AAP.

The index also shows median rents increased

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