Ms Crafts said she is fed up with the situation.
"We receive their (the school's) mail, they get ours."
It has resulted in personal information being opened at the school, but that is not the school's fault, she said.
"We've tried to fix this, but nothing has happened."
She said it is about the "cross-contamination" of data on mailing lists and people not checking it.
"We're fed up with it, the school's fed up with it.
"But if 'Big Brother' says it's the polling booth, that's it.
"There's nothing that can be done about it."
Greytown School principal Kevin McKay said the couple and the school are dealing with a 10-year "saga" with the address.
The school has no mailbox, with postal deliveries coming to the office.
He showed the Ministry of Education printouts listing the school as East St, with no number. "Isn't it interesting, that people rely on the Google property search, rather than ministry documents.
"The number 76 must have been entered by someone, and in this day and age it goes viral.
"It's annoying the heck out of the people across the road."
He said the lack of a number is sometimes a problem, including a school bank transaction that wouldn't go through without a number.
In those instances they use 73, the first number of the series of addresses the school sits on.
Wairarapa electoral returning officer Mike Dixon said there will be signage on the day pointing people to Greytown School.
"There shouldn't be anyone knocking on the door.
"We'll get the big signs out - it will be well and truly signposted."
