It took 196 of the first 236 seats declared, according to the South China Morning Post newspaper. Pro-Beijing candidates took just 28.
More than 2.9m people voted, a turnout of more than 71%, against 47% in 2015.
The election is being seen as a test of support for embattled Chief Executive Carrie Lam.
Pro-democracy protest groups want the vote to send a message to the Chinese government after five months of unrest and anti-government protests.
