All states and territories with the exception of NSW have closed their borders to the ACT in the wake of Canberra's snap seven-day lockdown.
Thursday's announcement prompted Queensland, Tasmania and the Northern Territory to impose new restrictions for people entering those jurisdictions after the lockdown.
Victoria, Western Australia and South Australia had already imposed travel restrictions on the ACT due to Sydney's escalating Covid outbreak.
NSW will require anyone who has been in the ACT from August 5 to stay-at-home for 14 days, starting from when they last left the territory.
The ACT is effectively creating a Canberra bubble, banning regional NSW residents, outside of neighbouring areas, from entering the territory without an exemption.
Residents of Canberra's surrounding regions will be given a standing exemption to enter the territory for essential purposes, as police prepare to ramp-up border checks.
Queensland Premier Annastacia Palaszczuk said the ACT would be declared a Covid hotspot from 1am on Saturday and that those who arrived afterwards would be required to go into hotel quarantine for 14 days.
Those entering the Sunshine State between the start of the lockdown in the ACT and 1am on Saturday will also need to do mandatory home quarantine for two weeks.
Tasmania also declared the ACT a Covid hotspot from the start of Canberra's lockdown.
Anyone who has been in the ACT will not be able to enter Tasmania unless they are an authorised traveller, but will still need to spend 14 days in quarantine.
