Mr Morrison said lifting people out of other parts of Afghanistan was not possible with operations limited to Kabul airport.
"The situation in Kabul does remain chaotic," he told reporters in Canberra on Friday.
Defence Minister Peter Dutton again tempered expectations of rescuing everyone trying to escape the new regime.
"I would love to say we could pull as many people out as possible from Afghanistan. But it is a very, very difficult situation," he told the Nine Network on Friday.
"There is no sense pretending that you can get to the airport easily. There are checkpoints on the way to the airport."
The United Kingdom helped 76 Australians and Afghan visa holders evacuate on Thursday.
Mr Morrison thanked British counterpart Boris Johnson for the Royal Air Force assistance in a phone call after the operation.
"They also discussed their joint desire to further expand their respective humanitarian programs to further assist displaced Afghans," a spokesman for Mr Morrison said.
Mr Johnson stressed the need for a concerted international effort to prevent a humanitarian crisis in Afghanistan through resettling refugees and increasing aid.
"The prime minister and prime minister Morrison update one another on the work the UK and Australia are doing to this effect," a Downing Street spokesperson said.
Australia has defended allocating just 3,000 places this financial year in its humanitarian program to Afghans fleeing the Taliban.
Mr Morrison has described the figure as a floor rather than a ceiling.
Canada has committed to taking 20,000 refugees, while the UK will do the same but over five years.