The ministry said there were 8552 in home-schooling at the start of December, up from 7749 at the middle of the year and about 1300 more than in the middle of last year.
Auckland Home Educators supports home-schooling in the Auckland region and its director, Adrian Koit, said the increase was quite massive.
The long lockdown in Auckland schools might have encouraged more people in that area to switch to home-schooling, he said.
"I think this long period of lockdown has certainly spurred a number of families to possibly apply for home-schooling."
Koit said it was also possible that some parents chose to home-school after the government started to roll out vaccinations for over 12-year-olds at the start of September.
Some parents might not have been happy that their children could be vaccinated without their consent, though they were not necessarily opposed to the Covid-19 vaccination, he said.