The People's Action Party (PAP) won an absolute majority of 83 seats in the 89-member Parliament. The opposition Workers' Party won six seats.
"I am deeply humbled by the confidence Singaporeans showed in me and my team and the heavy responsibility voters have entrusted to us," Lee said.
The PAP, which has been ruling the city-state for the past 50 years, got 69.86 percent of the popular vote, an increase of almost 10 percentage points from its share in 2011. The gain in percentage points was rated as a landslide win with an island-wide swing towards the PAP, often seen as losing its popularity on policies.
This was also the first general election without founder Prime Minister Lee Kuan Yew who died in March. He was the father of Prime Minister Lee Hsien Loong.
"I am happy with the outcome of the election. We won 83 seats and what was particularly satisfying was that we won back Punggol East," Lee said at an early-morning press conference after the final results were announced.

"It's a good result for the PAP, but it is an excellent result for Singapore," the media quoted Lee as saying.


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