The Town Hall service in Wollongong has also been called off, and a small, indoor dawn service will be held in the city primarily for RSL members.

Like last year, people across the Illawarra will be encouraged to mark the anniversary of Australian troops landing at Gallipoli in 1915 from their driveways at dawn.

Austinmer and Thirroul's sub-branch has also called off its dawn service, while Sydney's march is planned to go ahead with 500 people selected via a ballot system, the NSW RSL said on Friday.

Wollongong RSL sub-branch president Bruce Kafer said the public health requirements were just too onerous to make it practical in Wollongong.

These include the requirement that all outdoor events be ticketed, entirely seated, and cordoned off from the surrounding area with those who don't have tickets being actively turned away, which organisers did not want to do.

"As it stands right now there will be no Anzac Day march or parade in Wollongong this year," Rear Admiral Kafer told the Mercury.

"We based out decision [past December] on the restrictions that were in place on holding a controlled event in a safe way."

Rear Admiral Kafer said RSL representatives met with NSW Health, police and council representatives last month and decided the Town Hall service could not go ahead.

"We will be having a dawn service but it will be indoors, very similar to the Remembrance Day service that was held in the City Diggers club," he said.

"Our focus will be on our members and invited guests."

The size and layout of MacCabe Park in Wollongong meant it would be harder to control numbers and placement of people, than it would be indoors.

"The scale of security and everything else you'd need to ensure you don't have people coming along who've traditionally attended, then you either have to push them away, which would be dreadful, or you've got to account for them, seat them, socially distance them, [have] a single point of access.

"Other sub-branches may opt to do other things."