SYRIZA took control of Greeces largest region, Attica, on Sunday but candidates backed by New Democracy were victorious in the majority of the 13 districts.
Leftist candidate Rena Dourou edged out Attica Governor Yiannis Sgouros by winning 50.83 percent in the closest result of the night. It is the first time that a left wing party has taken control of Attica.
Greece's leftwing opposition Syriza party won the country's European elections, official projections showed late Sunday.
By Yiannis Papadoyiannis
The Piraeus Group is contemplating the idea of Geniki Banks full absorption, which would mean abandoning the plan for its subsidiary to take an autonomous course.
Sources have told Kathimerini that Piraeus officials have reviewed the groups strategy regarding Genikis future and that its absorption is currently the likeliest scenario.
Athens Mayor Giorgos Kaminis appeared to have held on to his seat in local authority elections after his leftist challenger conceded defeat, although the race for Attica governor remained too close to call late on Sunday night while a number of independents beat government-backed candidates in other key seats.
Greeces anti-terrorism squad was investigating on Sunday an apparent attack at the headquarters of the co-ruling Socialist PASOK party after two bullets pierced its windows, police said.
Greeks began voting in a second round of local and European Parliament elections on Sunday, seen as a litmus test for support for Prime Minister Antonis Samarass shaky government.
Greeks vote today in the European Parliament elections and the second round of local polls.