I am not sure which stadium produced the most and have been unsuccessful in finding the answer online, but I do know Yankee Stadium was leading the pace most of the season and completed the 2009 regular season with 237.
The new Yankee stadium
in 2009 New Yankee stadium
babe Ruth
Coors field
citi field 288
49ers
The Yankees played their first regular season home game in the original Yankee Stadium on April 18, 1923.
San Fransisco '49ers
The most likely site is Citi Field, the new home of the New York Mets since the 2009 season. The Mets haven't hosted an All-Star Game since 1964, their first season in Shea Stadium.
dodgers
i believe the record is 303 in 1999 at coors field