In the largest security increase nationwide since the Boston Marathon bombings, law enforcement and the Department of Homeland Security have joined forces to keep Americans safe this holiday week.
"Anytime you have a holiday it's something you want to look at," Ted Sexton, with the Los Angeles County Sheriff's Department, said.
"The Boston bombing took place on Patriot's Day," he noted. "The Times Square incident took place on May Day. Benghazi on 9/11. So dates, significant dates, are always a concern to us."
In Boston, security for the Fourth is tighter than ever as the city prepares to host its first large event since the marathon bombing.
For spectators, that means extra searches, plus increased patrols on the ground and in the air.
"You will see troopers, National Guard out there at security checkpoints and then the camera security system obviously is another layer of that," State police Col. Timothy Alben said.
In cities like Baltimore it's all hands on deck. As tens of thousands watch the fireworks, police say they'll have extra officers watching the crowd.
"We want to send a strong message that the Inner Harbor is safe," Baltimore Police Lt. Col. Darryl Desousa said.
In Atlanta, there's heightened security for Thursday's annual Peachtree Road Race.
In Los Angeles, officials are keeping a close eye on Union Station, hoping to avoid a terrorist attack like London's 2005 train bombings.
And in Washington, D.C., the capital is also on high alert near public transit and government buildings.
For some Americans, the extra security this Fourth of July no doubt eases fears. For others -- it's all about celebrating without fear.
"I feel safe because what is there to think about? You going to be afraid living your life?" one person asked. "I have more chance of getting hit crossing the street here."