Seamless and GrubHub Inc. announced Monday the signing of a definitive agreement to merge two of the nation's premier services for digital food ordering.

While a new name has yet to be decided, the combined organization will expand delivery service to more than 500 cities across the U.S. and U.K. from 20,000 local takeout restaurants.

"We are excited to combine the strengths of these two dynamic organizations in an industry that is rapidly gaining traction. We believe the merger will enhance the products we are able to offer both our diners and restaurants," Matt Maloney, GrubHub co-founder and CEO, said in a statement.

In 2012, the online and mobile platforms of the two organizations sent approximately $875 million in gross food sales to local takeout restaurants, resulting in combined earnings well in excess of $100 million.

“By combining our complementary restaurant and diner networks, we are well positioned for continued growth in a massive market," Maloney said.

According to the statement released on Monday, which neglected to disclose financial terms, Maloney will serve as CEO of the new organization while Jonathan Zabusky (CEO of Seamless) will serve as president.

The deal is currently awaiting regulatory approval.