The number of detainees at the Curtin immigration detention centre near Derby has more than halved since the Government introduced bridging visas in November so people could be released into the community while their protection claims are checked.
Just 718 men remain at Curtin, down from a peak of almost 1500 in March last year.
A department spokeswoman said the "irregular maritime arrivals" granted bridging visas were expected to draw on their own community links to find accommodation, including staying with family and friends.
Those who could not were provided with up to six weeks temporary accommodation in home stays, boarding houses and hostels while they found their own longer-term arrangements.
In some circumstances, they might be eligible for income support or rent assistance.
People had initial health, security and identity checks before being released and priority was given to people who had been in detention the longest.Despite the significant downsizing of Curtin, which reopened in June 2010, the spokeswoman said there were no plans to close it and it would continue to operate on a needs basis.
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