People in Bell are being told to leave the small Blue Mountains township, while others are warned they may be isolated for days as a large bushfire burns in the region.
The fire, which has scorched almost 38,000 hectares of bush and scrub, sparked Sunday afternoon's call for all unprepared residents to leave their homes and to head to Lithgow.
Those in the nearby village of Bilpin, as well as the communities of Mt Tomah and Berambing, are also being advised to relocate immediately to Richmond.
Those locals between Mountain Lagoon Road and Bowens Creek Road in Bilpin Village who wish to stay have been warned that they may become isolated.
The Rural Fire Service (RFS) have told residents that their properties need to be properly prepared because electricity to the area may be cut off for several days.
Meanwhile, people in Mt Irvine and Mt Wilson, just west of Bilpin, are being told to stay in place since there is fire burning along access roads.
These residents are also being told to prepare for a number of days of isolation.
The RFS advised people to try and stay with family and friends if possible, but evacuation centres have been set up in Richmond and Lithgow for when that is not an option.
For people living along Bells Line of Road, which runs along the region, the Department of Primary Industry said they can temporarily relocate their pets and livestock to the Hawkesbury Show Ground in Clarendon or to Lithgow Workers Club.
Animals should be brought along with their cages, food and medication, where required.