More than one-third of registered voters in Honolulu City Council District 4 have already cast votes in the special election between Trevor Ozawa and Tommy Waters. The official election day is April 13.

City Clerk Glen Takahashi’s office reported that as of 4 p.m. today, it had received 24,005 mail-in ballot envelopes and processed 134 ballots from those who voted in person at Honolulu Hale. About 66,000 registered District 4 voters are eligible to participate.

The election, which is estimated to cost the city about $250,000, was ordered after the Hawaii Supreme Court invalidated November’s general election results showing Ozawa beating Water by 22 votes. The court said elections officials should not have counted votes that were collected by election staff after 6 p.m.

This time around, the clerk’s office is stressing that ballots mailed via the U.S. Postal Service must be received by 6 p.m. April13. Voters also may drop off their completed, mail-in ballot envelopes at Honolulu Hale by 6 p.m. April 13.

The walk-in polling place is open from 8 a.m. to 4 p.m., until April 12, and 7 a.m. to 6 p.m. on April 13. The polling place is closed on Sunday.

Residents in District 4, which runs from Hawaii Kai to Ala Moana Park, may register to vote and then vote at Honolulu Hale. To be eligible, the applicant must be a U.S. citizen, a resident of Hawaii and at least 18 years old. They should bring a valid driver’s license, state ID or another acceptable form of identification to register.