There number of voters who changed their party registration to Democrat from unaffiliated more than quadrupled, according to the data.
Thousands more people have registered to vote in the November election in Bergen County as compared to the number of people who registered for the 2012 election, according to county data.
There were 10,479 new voters registered in the county from May 18 to August 16. Four years ago, 7,145 people registered to vote in that period.
"I think so many people are interested in this election," said Patricia DiCostanzo, superintendent of elections in the county. "I don't care who you vote for, I'm happy they get out and vote."
The biggest shift is in the number of voters who changed their party affiliation from undecided to Democrat. In 2012, 5,023 voters did so. So far in 2016, 22,898 voters have made the change.
"All of the movement that we are seeing is just reflective of the historic nature of this election," said Krista Jenkins, director of PublicMind and a political science professor at the Fairleigh Dickinson University.
In Bergen County, there are 356 Republicans who changed to Democrats in 2016. In 2012, there were just 89.
On the other side of the aisle, there are 466 Democrats who switched affiliations so far in 2016, while in 2012 there were 127 who made the switch, according to the data.
DiCostanzo said there was a surge in people registering to vote after some believed they had to declare a party ahead of the vote to participate in the primary, as they do in New York. In New Jersey, a voter can declare a party to vote on the day of the primary.
"People were asking us what delegates meant, what super delegates are. It's a history-making election," DiCostanzo said.
Sara Jerde may be reached at sjerde@njadvancemedia.com. Follow her on Twitter @SaraJerde.