Two recovery centres, in addition to six operating in the state's north, will be opened in the Hawkesbury-Nepean area to provide access to multiple government agencies for those seeking support and assistance.
Resilience NSW Metropolitan Sydney director Dean Betts is co-ordinating the task while Deputy Police Commissioner Mal Lanyon has been charged with the same role for the Northern Rivers disaster.
Prime Minister Scott Morrison declared a national emergency in NSW late on Friday, allowing the federal government to access stockpiled resources and remove red tape in terms of business and welfare support.
"It's going to be a long road back," he told reporters while touring the flooded Windsor region on Saturday.
Minor flooding is ongoing along the Hawkesbury River at North Richmond, although levels are falling.
However, based on Bureau of Meteorology predictions, the SES expects a number of areas will still be dangerously impacted along the western side of the river.
As of Sunday morning, they include low-lying portions at the back of properties in Grose Wold and North Richmond, and along Steading and Philip Charley creeks.
North Richmond Bridge has reopened but the Yarramundi Bridge between Yarramundi and Agnes Banks remains closed.
Waters peaked just above 14 metres at North Richmond on Wednesday morning.
Residents of a dozen councils in NSW are meanwhile eligible for disaster funding, with one-off payments of $1000 per adult and $400 per child available for those affected.
Workers, businesses and farmers who lost income can also apply for 13 weeks' assistance.
Premier Dominic Perrottet says the focus in the state's north remains on cleaning up and finding housing for displaced residents.
The first 20 motorhomes were expected to arrive in the region on Sunday, with 100 more to follow. The temporary accommodation is stage one of a $551 million housing support package.
As of Friday, about 5500 damaged residences had been assessed and about half deemed inhabitable.
The Insurance Council of Australia estimates more than 126,000 claims across Queensland and NSW will cost insurers $1.89 billion but concedes further claims are likely.
With the clean-up underway in western Sydney, residents are being advised not to travel there or to the Blue Mountains.
Elsewhere more than 100 workers are assessing damage to the state's roads after exceedingly heavy rain created countless mudslides and landslips.
Authorities say it could take some time for permanent fixes.
Rail infrastructure has also been badly damaged with services likely to be disrupted for the next week at least.
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