Two of National's traditional support parties - ACT and United Future - have made it into Parliament winning one electorate seat each.
ACT's David Seymour easily won the Epsom seat, while United Future leader Peter Dunne retained Ohariu.
Mr Seymour cruised to victory by a margin of more than 4000 votes. But with ACT's 13,904 party votes is not enough to bring a second MP into Parliament.
At the party's Epsom headquarters, Mr Seymour thanked his supporters, saying he looked forward to being in Parliament.
He said he could still be a voice in Parliament despite National being able to govern alone.
"My campaign was to be the best possible local representative of Epsom and to enable a centre-right Government."
Mr Dunne retained his long-held seat with a 930-vote lead over his closest rival, Labour's Virginia Andersen.
With 61 seats National could govern alone, but would still have plenty of support from some of the minor parties and leader John Key indicated he would talk to the two parties.