Regardless, it registered seismic activity about 7 miles south of Washington, D.C.
The Philadelphia Phillies were playing the Washington Nationals at the time, but the sound wasn't related to any fireworks or celebration at the stadium.
Another person suggested a meteorite, but there aren't any signs of one yet. There also isn't any smoke being reported by observers.
"This is how big it was. I am on Capitol Hill and it was extremely loud. People say, windows rattled in Shaw, etc.," said Hussein Ibish, the senior resident scholar at Gulf States Institute.
"Felt like an explosion in the Annapolis area. Wife was 5 miles away and thought a big tree fell in the yard with how the house shook. I think we had it first and it passed Bowie and DC to you," said Ron from Maryland to legal analyst Brad Moss on Twitter.
But that's exactly what one freelancer in Maryland swore happened. He reported air aficionados watching air traffic, claiming that the sound was possibly DC Air National Guard and an F-16 from Atlantic City.
"Seems there was a Alert Scramble near DC area. and Atlantic City F-16 COSMIC," one individual said.
A Nest camera in a garage in Edgewater, MD, showed whatever it was rattled the attic panel. A Ring doorbell camera recorded the boom as well in Bowie, MD. Another video was posted from Odenton, MD.
A Fairfax, VA, couple was recording a song when they heard the sound, and their house could be heard shaking.
Neighbors all over northern Virginia also reported the sound on their local neighborhood sites.
The Department of Defense confirmed to the Annapolis Office of Emergency Management that "the loud boom that was heard across the DMV area was caused by an authorized DOD flight. This flight caused a sonic boom. That is all the information available at this time."
You can see those videos below or at the link here.