The ruling Al-Insaf Party has secured 80 seats in the 176-seat Parliament, according to official results released by the National Independent Electoral Commission.
While the parties allied with the ruling party got 36 seats, the opposition was able to get only 24 deputies.
A second round of elections will be held on May 27 for the remaining 36 seats in the parliament. According to the electoral system in the country, if the parties do not get more than 50 percent of the votes in regions that have one or two deputies, re-elections are held and the party with the most votes wins.
In the country, where approximately 1.7 million voters voted, turnout was 71.8 percent.
The ruling party also managed to get all 13 local councils.
The President of Mauritania, Mohammed Vild Sheikh al-Ghazwani, dissolved the National Assembly in March for the elections.