"We walked to City Hall" after the Phillies' victory, Trout said. "The fans were crazy."
The Angels' two-game, interleague series with the Phillies will be a whirlwind of a homecoming for Trout, as well as a milestone moment for Millville, a sprawling community in rural Cumberland County about 40 miles from Philadelphia.
"Three," Millville High coach Roy Hallenbeck joked about the number of people who will be left in the town on Tuesday night, while everybody else makes the drive up Route 55 and across the Walt Whitman Bridge to see their favorite son take on his former favorite team.
There's a buzz of anticipation around Trout's return because of his status in the sport. He was the American League's rookie of the year in 2012 and was runner-up for the league's Most Valuable Player award in both 2012 and 2013.
Because of his speed and power, Trout has been compared with legendary New York Yankees outfielder Mickey Mantle.
"I never saw Mickey Mantle," Kansas City Royals scout Jim Fregosi Jr. said. "[Trout] is a unique player because you don't see that combination of power and speed.
"He's not some skinny kid who is fast. He is a power runner. Everything he does has power to it."
The 6-foot-2, 230-pound Trout, who will be 23 in August, grew up a Phillies fan, although he also had a soft spot for the Yankees because of his admiration for Derek Jeter.
"I was an Utley fan," Trout said of Phillies second baseman Chase Utley. "And [Jimmy] Rollins of course because I was a shortstop."
Mike's father, Jeff Trout, who played minor-league baseball under Charlie Manuel but gave up the sport to teach and coach in Millville, said he used to take his youngest son to Phillies and Yankees games.
"All the time," Jeff Trout said. "Jeter and Utley were his boys - two good role models."
In his two-plus seasons in the majors, Mike Trout has played before hometown fans who made their way to games in Baltimore, New York and Washington. His parents, retired teachers Jeff and Debbie, attend most of his games, and he is used to seeing familiar faces when he plays on the East Coast.
But this will be different.
Phillies officials have confirmed that the town of Millville has sold about 4,000 tickets for Tuesday night's game. Hundreds of other fans from South Jersey are likely to have purchased tickets on their own.
The event will be "Millville Night" in the stadium, with Mayor Michael Santiago throwing out the first pitch, the Millville High School band performing before the game, and the school's choral ensemble singing the national anthem.
Hallenback, his assistant coaches, some other school officials, and the Millville varsity will be sitting in the center-field seats.
"It's cool when you're on deck or in the outfield and you look up and see somebody that you know," Trout said in an interview last month in Washington.
Trout will have little time to spend with family and friends. The Angels will play the Phillies twice in the span of 17 hours and then will fly to Los Angeles.
"Sometimes it gets a little overwhelming," Trout said of playing games close to home. "You want to see everybody and talk to everybody. But you have things to do. You have to prepare for the game."
Angels manager Mike Scioscia can relate. He attended high school in Upper Darby and returned to play against the Phillies as a member of the Los Angeles Dodgers.
"When I went back it wasn't the magnitude of what it will be when Mike Trout goes back," Scioscia said. "I had so much fun with it. It sometimes is exhausting. You're trying to take the couple of hours you have in the day to see your friends and family. It's almost a relief when the game starts."
Trout, who has played in all 36 games this season for the Angels, is batting .273 with seven home runs, 22 RBIs and four stolen bases. In March, he signed a six-year, $144.5 million contract extension. Scioscia said nothing - not fortune, not fame - has changed the athlete who has become the face of baseball at the age of 22.
"He's the same," Scioscia said. "He has handled everything - the contract, going to cities, getting interviews - magnificently since day one in the major leagues."
Trout has never played a game in Citizens Bank Park. He was there for a predraft workout early in June 2009, just a few days before the Angels made him the 25th pick in the first round.
Trout attended the workout even though the Phillies didn't have a first-round pick and it was widely assumed he would be selected long before his hometown team would make its initial selection.
"He said he wanted to be there out of respect," said Cherry Hill West coach Dan McMaster, an associate Phillies scout who was there that day.
On Tuesday night, Trout will be back in town. Just five years after he was batting against pitchers in the Cape-Atlantic League, he will face the Phillies as one of the most acclaimed athletes in the country.
But there still probably will be something special about his first big-league game in the park that hosts his former favorite team.
As Scioscia notes, "You only have one home."