UPDATE: THE NSW government has declared five natural disaster zones in the state's north following days of severe flooding.

Emergency services minister Mike Gallacher has declared the zones for Bellingen, Byron, Kyogle, Lismore and Richmond Valley local government areas, unlocking government funding to help pay for repairs.

The government will monitor other flood affected areas and declare further natural disaster zones if necessary.

It comes as around 1500 people remain isolated by the floods, although State Emergency Service spokesman Phil Campbell said most should have access restored by tomorrow.

The 250 residents of Goodooga, north of Bourke, are expected to be isolated for two more days.