Ouattara's RHDP won 137 compared to 91 for opposition parties in Saturday's polls, according to results published by the West African country's electoral commission.
The vote passed off peacefully and for the first time in a decade included all of the country's main political players, providing hope that Ivory Coast has begun to emerge from recent turbulence.
It was a key test of stability following violence surrounding October's presidential vote, which was boycotted by the opposition and claimed 87 lives.
The main opposition PDCI has however alleged electoral fraud, while the FPI party of ex-president Laurent Gbagbo had called on its supporters to remain calm and await the official results.
Tuesday's results showed the largest opposition grouping will be a coalition formed by PDCI members and Gbagbo supporters, which won 50 seats.
One seat remains unfilled in the 255-seat assembly due to the death of a candidate in a northern constituency, where an election will be held within a month.
Ces élections, qui se sont déroulées sans violence contrairement à de récents scrutins, dont la présidentielle d’octobre 2020, réunissaient pour la première fois depuis dix ans l’ensemble des principaux acteurs politiques. https://t.co/viHLpl3eS6
— Le Monde Afrique (@LeMonde_Afrique) March 9, 2021
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Turnout was 37.88 percent, the same as in the last legislative elections in 2016.
"The RHDP has succeeded in tipping many regions in its favour and it is in the process of acquiring the status of a national party, beyond its traditional strongholds in the north of the country," political scientist Sylvain N'Guessan said ahead of the complete results but with partial results known.
The return of Gbagbo's FPI, or Ivorian Popular Front, which participated after a decade of boycott, "did not have a great influence on either the score or the turnout," said N'Guessan.
The FPI had boycotted all polls since the arrest of Gbagbo in 2011 in Abidjan and his subsequent transfer to the International Criminal Court (ICC) in The Hague.
His arrest followed violence after the 2010 presidential election that left 3,000 dead.
Gbagbo was acquitted in January 2019 and is now living in Brussels pending the outcome of an appeal, though he has announced plans to return home.
Ouattara has recently reached out to his old foe in a bid for "national reconciliation" and issued Gbagbo with two passports, one of them a diplomatic pass.
The 79-year-old president had ignited political unrest last year when he announced he would seek a third term in office -- a scheme that critics said sidestepped constitutional limits.
(AFP)
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