Philadelphia's Taney Dragons had talent on all levels, including 13-year-old Mo'ne Davis, the star pitcher and the first Little Leaguer to grace the cover of Sports Illustrated.
Chicago's Jackie Robinson West team also had a talented and historic roster as Chicago's first all-African-American team to win the national championship.
On Wednesday, both cities celebrated their hometown heroes, CBS News' Elaine Quijano reports.
The Taney Dragons rode aboard a colorful float Wednesday, dancing and waving their way through the streets of Philadelphia.
"That's what this is really all about, celebrating young people who are doing the right thing, parents and other caring adults behind them each and every day," Philadelphia Mayor Michael Nutter said.
Throughout their run, much of the focus was on Davis. She's the team's ace pitcher and the first girl ever to throw a complete game shutout in the Little League World Series.
"It's really nice to know that you have supporters in your city and that they're always going to be supporting you no matter what," Davis said.
But the City of Brotherly Love wasn't done showing its affection. The Phillies honored their pint-size counterparts, the Little Leaguers sharing the big league field with their hometown heroes. Then the entire team threw out the first pitch.
Seven hundred miles away, the Jackie Robinson West team celebrated on their home field in Chicago before setting off for a parade and making a pit stop to pick up the 2005 White Sox World Series trophy.
The 15-mile route concluded at Millennium Park, where thousands packed in to see their championship team.
"Wow, wow, wow, this is unbelievable," team manager Darold Butler told the crowd.
Butler thanked the city and all those involved in helping the kids become champs.
"They are the coolest, coolest little group of guys I've ever been around in my life," he said.
These two teams faced off last week in South Williamsport, Pennsylvania.
The Jackie Robinson squad beat the Taney Dragons to eventually grab the national title.
Chicago lost to the international champs, South Korea, in the final game, but supporters for both teams say all these kids came back home winners.