The schedule for the event, which starts Dec. 26, was released by Hockey Canada on Friday. All games will be played at Air Canada Centre and Bell Centre in Montreal.
The U.S., which won the bronze medal at the 2016 WJC, and Canada will be in Group B for the preliminary round, with all their games at Air Canada Centre. Also in Group B are Latvia, Russia and Slovakia.
The first game for the U.S. will be against Latvia on Dec. 26. Canada, which finished sixth at the 2016 WJC, will start the tournament against Russia on Dec. 26.
Defending gold medalist Finland is in Group A, along with Czech Republic, Denmark, Sweden and Switzerland. Their preliminary-round games will be at Bell Centre.
The quarterfinals will be Jan. 2, 2017, and the semifinals Jan. 4.
The 11-day tournament will conclude with the gold- and bronze-medal games at Bell Centre on Jan. 5.
It's the second time in three years Toronto and Montreal have hosted the World Juniors. In 2015 Canada won the gold medal when the championship game was played at Air Canada Centre.
"It was unbelievable, the cities we were in, Montreal and Toronto," Edmonton Oilers center Connor McDavid, who helped Canada win the gold in 2015, told Hockey Canada. "They were so good and the fans were so loud and the energy in the buildings was electric. It was definitely some of the best memories I've had playing hockey."
