Yes, Washington, DC has same-day voter registration. Same-day registration allows you to register and vote in person on the same day. You can also use it to update your voter registration information.
The deadline to register to vote in DC is 21 days before Election Day. If this registration deadline has passed, same-day registration is available in DC during early voting and on Election Day.
You must provide a document with your name and current address to prove your residency.