"(Orban's ruling) Fidesz party won a two-thirds parliamentary majority at the April 6 election," a statement published by state news agency MTI read.
The result was based on 99.99 per cent of votes counted by the national election office, MTI said.
Parties can appeal the results however, with official figures only due to be published by April 25.
Orban's ruling right-wing Fidesz party was already the clear winner of the election hours after polls closed last Sunday. But its two-thirds majority remained in doubt until ballots from abroad -- which could have changed the outcome in several voting districts -- were counted.
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This means Fidesz (along with its junior coalition partner the Christian Democrats) will have 133 seats in the new 199-seat parliament -- barely scraping together a two-thirds majority but still allowing it to steamroll legislation through parliament without the need for approval from any other party -- while 38 seats will go to the Socialist-led alliance and 23 to Jobbik.
Orban already put his supermajority to devastating use during his first term, launching a legislative blitz that opponents said tightened his control over democratic institutions and restricted checks and balances.
The Fidesz-led government wrote a controversial new constitution and passed over 800 new laws through parliament. Orban also placed loyal appointees -- some with nine-year terms -- in charge of institutions such as the media authority, the central bank and the constitutional court.
The prime minister insists he has cleaned up the chaos left by eight years of left-wing "post-communist" government and that his popularity at home is a vindication of his policies.
With changes to the constitution and major laws already passed during his first term, some analysts say Orban will now focus on consolidating his power.