The electoral commission has encouraged people to post their voting papers back by Monday, March 21, to make sure they arrive in time. Voting officially closes on March 24.
The final result will be revealed on March 30.
Voting packs for the second referendum on the New Zealand flag should now be in the hands of all enrolled voters nationwide.
Replacement voting papers are available at www.elections.org.nz, or call 0800 367 656.
The referendum process has prompted fierce debate across the country. The biggest disagreement has been about whether the flag should be changed at all.
But there has also been criticism about the absence of designers on the panel which chose the alternative designs, and heated discussion about the flags which were selected for the final list.
Both the Labour Party and New Zealand First wanted the $26 million referendum to be scrapped, in particular if the vote at the first stage was lower than 50 per cent.
Polling has consistently shown a majority of voters prefer the current flag to the alternative.
VOTING FOR THE FLAG
The number of voting papers received by the Electoral Commission:
Monday, March 7: 167,772
Tuesday, March 8: 60,691
Wednesday, March 9: 361,778
Thursday, March 10: 382,800*
Friday, March 11: 228,800*
Total (Cumulative): 1,201,841
* Estimate only