The Shiites, a majority in Sunni-ruled Bahrain, lost seats compared to the previous vote four years ago, in large part due to the boycott by the al-Wefaq group. In total, only five candidates from established political organizations won seats the lowest number since elections in 2006.
It was the country's first full parliamentary elections since Shiite-led protests against the Sunni monarchy erupted in February 2011.
Bahrain's parliament, or National Assembly, is comprised of 80 seats 40 royally-appointed in the upper house and 40 elected seats in the lower house. The lower house has limited powers to question ministers. Its members cannot pass laws unless the king signs off.
The Western-allied Arab nation hosts the U.S. Navy's 5th Fleet and is part of the U.S.-led coalition striking the Islamic State group in Iraq and Syria.
Bahrain has been roiled by low-level unrest over the past nearly four years. Shiites say the government is failing to enact political reforms and address other grievances in the wake of the protests.
Justice Minister Khalid Bin Ali hailed the elections as a sign that citizens want to be represented in parliament and not on the streets.
"Bahrainis deserve a country that they can truly participate in the decision-making of. They do not deserve and will not accept elections that further marginalize them," the group said in a statement.
The constitution requires that all members of parliament swear loyalty to the country and the king.
