Oz Lotto $70m jackpot: Search begins for second winner

A $70 million Oz Lotto jackpot split between two winners has been described as "the biggest prize" ever handed down in the New South Wales town of Lithgow. 

The jackpot, which was the biggest Oz Lotto prize in five years, was split last night between a Lithgow man aged in his 50s and a Victorian entrant who is yet to claim the money.

The NSW man, who did claim his $35 million share and didn't want his identity revealed, said he was "blown away" when he found out about his win.

"Oh fair dinkum? You're kidding?! That is the best news I've had in a long time. Hallelujah!" he said.

"It goes without saying I'll be helping the kids out and I'm sure my retirement plans will be fast-tracked."

Jimmy Nguyen, the owner of the local Lithgow newsagent that sold the man his winning ticket, told 9NEWS the prize is historic for the town.

"This is the biggest prize in Lithgow so far - we always hoped that one day it would happen," he said.

"We can't be more excited, I'm very happy for my customer.

"This is the luckiest shop in the Blue Mountains area - come here and you get the winning ticket."

Meanwhile, the search has begun for the he mystery Victorian winner who is being urged to check their entry.

Despite being registered, Oz Lotto couldn't contact the winner because their details were incomplete.

The winning Victorian entry was purchased online from Australia's official lotteries at thelott.com.

In addition to the two division one winning entries, more than 1.17 million prizes worth more than $26.4 million were won in divisions two to seven across Australia.

Tuesday night's result ends eight weeks of jackpotting which saw Oz Lotto climb to $70 million. Next Tuesday's jackpot is $2 million.

But it's not the end of a big lotteries week - Thursday's Powerball is at $80 million.

With AAP.