Update, Oct. 6: The D.C. Board of Elections tweeted Tuesday that all 55 ballot drop boxes are now open. Fifty initially opened on Monday, and the remaining five were expected to open on Thursday, Oct. 8 — but that timeline was accelerated. All drop boxes will remain open until the end of Election Day.

Original Post: Dozens of ballot drop boxes are now open in D.C. for voters who have completed their mail ballots but don’t want to rely on the U.S. Postal Service to send them back in.

Fifty of the 55 planned drop boxes are open today. The remaining five drop boxes will open Thursday; those are located at the Penn Branch Shopping Center, Foggy Bottom/GWU Metro, Northwest One Neighborhood Library, Southeast Neighborhood Library, Fort Stanton Recreation Center.

Here’s a full list of all drop-box locations and a map of where to find them.

D.C. officials say ballots will be collected from each of the drop boxes twice a day. Areas east of the Anacostia River will have a larger number of drop boxes because of complaints of spotty mail service there over the summer.

The city moved to install drop boxes after it decided to send every registered voter a ballot in the mail, in hopes of pushing more of this year’s election away from in-person voting because of the ongoing pandemic. D.C. officials insist that the 400-pound drop boxes are secure and have been placed in areas with electronic surveillance. President Trump, meanwhile, has sought to discredit vote-by-mail and ballot drop boxes, calling them a “voting security disaster” and said they were “not Covid sanitized” in a late August tweet. Twitter issued a “public interest notice” on the tweet for “violating our Civic Integrity Policy for making misleading health claims that could potentially dissuade people from participation in voting.” Numerous states that vote exclusively by mail have used ballot drop boxes without incident.

Drop boxes are also available for voters in Maryland, and this summer the Virginia legislature authorized jurisdictions across the state to set up drop-off sites of their own.

D.C.’s drop boxes will be open until 8 p.m. on Election Day. Voters can also choose to drop off their ballot at an of the 32 early voting sites that open on Oct. 27, or at any of the 95 polling places that will be open on Election Day. The voter registration deadline is Oct. 13, and city officials say that if you have not received a mail ballot by Oct. 21 you should expect to vote in person.

D.C. officials say that voters should always remember to sign and date their ballot before mailing it in or dropping it off. Here’s everything else you need to know about voting in D.C.