An additional 20 local government areas hit by bushfires across NSW have been declared natural disaster areas.

Funding assistance is now available to residents in Bathurst, Bega Valley, Bourke, Brewarrina, Central Darling, Cessnock, Cobar, Dubbo, Eurobodalla, Gwydir, Lithgow, Mid-Western regional, Moree Plains, Muswellbrook, Narrabri, Narromine, Oberon, Singleton and Wellington.

"Communities in these areas have been threatened and disrupted by fires that have burnt during periods of persistent and dangerous fire conditions," federal minister for emergency management, Mark Dreyfus said in a statement.

"A number of fires in the far west of NSW have had a significant impact on rural properties, causing millions of dollars in damage to pasture, fencing and other farm infrastructure."

NSW Emergency Services Minister Mike Gallacher said the extension of disaster declarations to 71 areas, is a further reminder of the extraordinary period of bush fire activity NSW experienced this year.

In mid-January more than 100 bushfires broke out across NSW, with a major blaze starting near Coonabarabran.

About 54,000 hectares were destroyed near the town and 53 families lost their homes.