There are 20 stadiums in use by International League (IL) baseball teams. The oldest stadium is Sahlen Field, home of the Buffalo Bisons, which was built in 1988. The newest stadium is Polar Park, home of the Worcester Red Sox, which opened in 2021. Two stadiums were built in the 1980s, six in the 1990s, seven in the 2000s, four in the 2010s, and one in the 2020s. The highest seating capacity of all active stadiums is 16,600 at Buffalo's Sahlen Field. The stadium with the lowest capacity is CHS Field, the home of the St. Paul Saints, which seats 7,210. All stadiums use a grass surface.
Some 100 additional ballparks located among over 60 municipalities formerly hosted International League teams since the league's formation in 1884. These include stadiums from the Eastern League (1884), New York State League (1885), International Association (1888-1890), and Eastern Association (1891), each of which league officials consider part of its origins, and the Eastern League (1892–1911), which changed its name to the International League in 1912. Of the stadiums with known opening dates, the oldest to have hosted IL games was Pynchon Park (1853), home of the Springfield Cubs and Springfield Ponies; Polar Park is also the newest of all stadiums to host IL games. The highest known seating capacity was 55,000 at Municipal Stadium, the Baltimore Orioles home, which was designed to host football. The stadium with the lowest known capacity was the Barnum Grounds, home of the Bridgeport Giants, which seated only 800.
Active stadiums {| class="wikitable sortable plainrowheaders" |- !scope="col" | Name !scope="col" | Team !scope="col" | City !scope="col" | State !scope="col" | Opened !scope="col" | Capacity !scope="col" class="unsortable" | |- !scope="row" | AutoZone Park |Memphis Redbirds |Memphis |Tennessee |align="center" | 2000 |align="center" | 10,000 |align="center" | |- !scope="row" | CHS Field |St. Paul Saints |Saint Paul |Minnesota |align="center" | 2015 |align="center" | 7,210 |align="center" | |- !scope="row" | Coca-Cola Park |Lehigh Valley IronPigs |Allentown |Pennsylvania |align="center" | 2008 |align="center" | 10,100 |align="center" | |- !scope="row" | Durham Bulls Athletic Park |Durham Bulls |Durham |North Carolina |align="center" | 1995 |align="center" | 10,000 |align="center" | |- !scope="row" | ESL Ballpark |Rochester Red Wings |Rochester |New York |align="center" | 1997 |align="center" | 10,840 |align="center" | |- !scope="row" | Fifth Third Field |Toledo Mud Hens |Toledo |Ohio |align="center" | 2002 |align="center" | 10,300 |align="center" | |- !scope="row" | First Horizon Park |Nashville Sounds |Nashville |Tennessee |align="center" | 2015 |align="center" | 10,000 |align="center" | |- !scope="row" | Gwinnett Field |Gwinnett Stripers |Lawrenceville |Georgia |align="center" | 2009 |align="center" | 10,427 |align="center" | |- !scope="row" | Harbor Park |Norfolk Tides |Norfolk |Virginia |align="center" | 1993 |align="center" | 11,856 |align="center" | |- !scope="row" | Huntington Park |Columbus Clippers |Columbus |Ohio |align="center" | 2009 |align="center" | 10,100 |align="center" | |- !scope="row" | Louisville Slugger Field |Louisville Bats |Louisville |Kentucky |align="center" | 2000 |align="center" | 13,131 |align="center" | |- !scope="row" | NBT Bank Stadium |Syracuse Mets |Syracuse |New York |align="center" | 1997 |align="center" | 10,815 |align="center" | |- !scope="row" | PNC Field |Scranton/Wilkes-Barre RailRiders |Moosic |Pennsylvania |align="center" | 1989 |align="center" | 10,000 |align="center" | |- !scope="row" | Polar Park |Worcester Red Sox |Worcester |Massachusetts |align="center" | 2021 |align="center" | 9,508 |align="center" | |- !scope="row" | Principal Park |Iowa Cubs |Des Moines |Iowa |align="center" | 1992 |align="center" | 11,500 |align="center" | |- !scope="row" | Sahlen Field |Buffalo Bisons |Buffalo |New York |align="center" | 1988 |align="center" | 16,600 |align="center" | |- !scope="row" | Truist Field |Charlotte Knights |Charlotte |North Carolina |align="center" | 2014 |align="center" | 10,200 |align="center" | |- !scope="row" | Victory Field |Indianapolis Indians |Indianapolis |Indiana |align="center" | 1996 |align="center" | 13,750 |align="center" | |- !scope="row" | VyStar Ballpark |Jacksonville Jumbo Shrimp |Jacksonville |Florida |align="center" | 2003 |align="center" | 11,000 |align="center" | |- !scope="row" | Werner Park |Omaha Storm Chasers |Papillon |Nebraska |align="center" | 2011 |align="center" | 9,023 |align="center" |
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All stadiums +Key Stadium's name in its last season of hosting IL baseball Opening of earliest stadium variant used for hosting IL baseball Stadium's most recent capacity while hosting IL baseball