Honolulu Mayor Mufi Hannemann took a significant fund-raising lead over his opponents by adding more than $640,000 to his campaign coffers in the first six months of this year.

Hannemann, who is facing nine opponents, including City Council member Ann H. Kobayashi and University of Hawai'i engineering professor Panos D. Prevedouros, has nearly $2.7 million in advance of the Sept. 20 primary election.

Between Jan. 1 and June 30, Hannemann raised $642,514.49, according to campaign fund-raising reports filed today.

Kobayashi, who gave up her seat to run for mayor on July 22, raised $5,485.24 during the same period and $34,650 in 2007. Prevedouros has yet to report any campaign contributions.