Printing and publishing business PMP will close its Sydney plant that produces the White and Yellow Pages phone directories.
PMP on Thursday said its Chullora print plant in Sydney's west would close on June 30, 2013, because of falling demand for printed phone books.
The majority of Chullora employees would likely be made redundant, the company said.
Management is consulting with affected workers and their union representatives.
"The change in print volumes reflect changing consumer needs, which is an inevitable step in response to the realities of the digital marketplace," PMP chief executive Peter George said in a statement.
Redundancies are likely to cost the company about $11.5 million between June and October 2013.
The Yellow Pages and White Pages work will be done from PMP's printing plant in Moorebank, in Sydney's southwest.