Voter turnout in Wellington was up slightly to 40.85 per cent, excluding special votes, from 39.54 per cent in 2010.
The council now has four Green members - including Ms Wade-Brown who, although independent, is linked to the party, as well as incumbent councillor Iona Pannett and newcomers David Lee and Sarah Free.
A jubilant Ms Wade-Brown said she had been given a clear mandate.
"I'm feeling really pleased, really grateful for all the supporters and looking forward to the next three years."
She said voter turnout had improved in Wellington - and it was good to know the result on the day.
In the last election, she faced a nail-biting wait for special votes to be counted before her victory was confirmed.
Ms Wade-Brown did not yet know who had come second, but the strongest contender was believed to be former cricketer and Wellington councillor John Morrison.
She said Mr Morrison had a different vision and personality. She would wait to see who had come in second before calling other candidates.
She would begin announcing a programme of projects once the shape of the council was clear - including cycle lanes, the high-tech sector, a conference venue and a museum celebrating the city's film industry.
Ms Wade-Brown said she was looking forward to working with re-elected Auckland Mayor Len Brown and Christchurch Mayor elect Lianne Dalziel.