Estimated Number Of Unlawful Non-Citizens (unc) By Length Of Overstay, As At 30 June 2011 ​

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As of 30 June 2011, the Department of Home Affairs estimated 58,400 unlawful non-citizens (UNCs) in Australia. The majority—36.6% (21,380 people)—had overstayed for more than 10 years, while 22.1% (12,880) had overstayed 12 months or less. The remaining population was distributed across intermediate overstay periods, with the 1-to-2 years category representing the second-largest cohort at 12.3%. UNCs are defined under the Migration Act 1958 as individuals whose visas have been cancelled or who remained in Australia after visa expiration without valid status. The estimate excludes non-citizens who arrived before 1 September 1994. The Department declined to provide separate documentation on re-entry bans, citing unreasonable resource diversion.