Petco Park is a ballpark in San Diego, California. It is the home of the San Diego Padres of Major League Baseball. The ballpark is located in the East Village neighborhood of downtown San Diego, adjacent to the Gaslamp Quarter. Petco Park opened in 2004, replacing San Diego Stadium as the Padres' home venue, where the team played from th…Petco Park is a ballpark in San Diego, California. It is the home of the San Diego Padres of Major League Baseball. The ballpark is located in the East Village neighborhood of downtown San Diego, adjacent to the Gaslamp Quarter. Petco Park opened in 2004, replacing San Diego Stadium as the Padres' home venue, where the team played from their inception in 1969 to 2003.