The Greens are performing at a similar rate to the elections in 2007
The Greens have become the second largest party in Norwich, after gaining three seats to take their tally to 13.
They still trail Labour in the city, who won 15 seats, but have overtaken the Lib Dems who lost five seats and have now only six.
However, the Greens are performing less well nationally than they did in 2004.
Councillor Adrian Ramsay, leader of the Green Party group on Norwich City Council, said he was "delighted" with "such an excellent result".
Councillor Ramsay said: "Thousands of Norwich residents have endorsed our positive campaign based on more environmentally friendly and socially fair policies for the city council.
"The Green Party is now clearly the main challenge to Labour in Norwich, both on the city council and as we bid to win the Norwich South Westminster seat from Charles Clarke at the next general election."
In 248 key wards fought by the Greens across England and Wales, their average vote is 8% and is down by a half point on average where they also fought the ward last year.
They also lost their only seat in Manchester and lost one seat in Oxford, leaving them with seven.
Among the other small parties, the BNP is also performing at roughly the same as it did in 2007 - averaging 11% in contested wards - but again is performing less well than in 2004.
Meanwhile, votes for UKIP are well down on 2004, but up slightly on 2007. So far, the party is averaging 7% in wards they fought.