"NZ Post has tried to downplay the effects of these cuts by saying more jobs will be created in Auckland, the Manawatu and Christchurch, but the fact is most people won't be able to relocate to take them up," Mr Gallagher said.
"This is a bad time to find yourself on the dole queue. For people left without work in Northland it's going to be incredibly hard to find another job with secure hours and good rates of pay.
"The Government should support the regions by making jobs a priority and reminding NZ Post that it is a vital public service. It should not chase profit at the expense of communities like Northland."
EPMU members at NZ Post will be entitled to redundancy pay under their collective agreement, he said.
An NZ Post spokesman told the Northern Advocate the workers would be offered relocation - though he acknowledged this would be difficult for some staff - and the company would give any other support it could, including linking them with other employers, putting together CVs and budgeting advice.
Consultation with the staff would continue for the next week with a final decision on the new structure - which the spokesman said would lead to a more efficient and cost effective service - will be outlined on October 24.