American League
MLB conference. 15 current members.
Members over time
- Athletics since 1901
- Baltimore Orioles since 1901
- Boston Red Sox since 1901
- Chicago White Sox since 1901
- Cleveland Guardians since 1901
- Detroit Tigers since 1901
- Minnesota Twins since 1901
- New York Yankees since 1901
- Los Angeles Angels since 1961
- Texas Rangers since 1961
- Kansas City Royals since 1969
- Seattle Pilots 1969
- Milwaukee Brewers 1970 to 1997
- Seattle Mariners since 1977
- Toronto Blue Jays since 1977
- Tampa Bay Rays since 1998
- Houston Astros since 2013
Members
- Athletics Since 1901 Formerly Kansas City Athletics, Philadelphia Athletics
- Baltimore Orioles Since 1901 Formerly Milwaukee Brewers, St. Louis Browns
- Boston Red Sox Since 1901 Formerly Boston Americans
- Chicago White Sox Since 1901
- Cleveland Guardians Since 1901 Formerly Cleveland Bluebirds, Cleveland Broncos, Cleveland Indians and 2 more
- Detroit Tigers Since 1901
- Houston Astros Since 1962 Formerly Houston Colt .45s
- Kansas City Royals Since 1969
- Los Angeles Angels Since 1961 Formerly Anaheim Angels, California Angels, Los Angeles Angels of Anaheim
- Minnesota Twins Since 1901 Formerly Washington Nationals, Washington Senators
- New York Yankees Since 1901 Formerly Baltimore Orioles, New York Highlanders
- Seattle Mariners Since 1977
- Tampa Bay Rays Since 1998 Formerly Tampa Bay Devil Rays
- Texas Rangers Since 1961 Formerly Washington Senators
- Toronto Blue Jays Since 1977
All-time conference records
| Team | Record | Win % | Seasons as a member |
|---|---|---|---|
| New York Yankees | 10825-8243-94 | 56.7% | Since 1901 |
| Boston Red Sox | 9809-9189-82 | 51.6% | Since 1901 |
| Cleveland Guardians | 9747-9231-92 | 51.4% | Since 1901 |
| Detroit Tigers | 9534-9432-95 | 50.3% | Since 1901 |
| Chicago White Sox | 9435-9463-103 | 49.9% | Since 1901 |
| Athletics | 9181-9749-89 | 48.5% | Since 1901 |
| Minnesota Twins | 9093-9830-109 | 48.1% | Since 1901 |
| Baltimore Orioles | 8988-9932-110 | 47.5% | Since 1901 |
| Los Angeles Angels | 4839-5006-3 | 49.2% | Since 1961 |
| Texas Rangers | 4665-5158-7 | 47.5% | Since 1961 |
| Kansas City Royals | 4078-4461-2 | 47.8% | Since 1969 |
| Toronto Blue Jays | 3617-3651-3 | 49.8% | Since 1977 |
| Seattle Mariners | 3446-3806-2 | 47.5% | Since 1977 |
| Milwaukee Brewers | 2133-2267-2 | 48.5% | 1970 to 1997 |
| Tampa Bay Rays | 1945-2055 | 48.6% | Since 1998 |
| Houston Astros | 1015-843 | 54.6% | Since 2013 |
| Seattle Pilots | 64-98-1 | 39.6% | 1969 |
Games against fellow members only, counting both teams' conference in the season each game was played. Current members are in bold.
Most played conference rivalries
| Series | Record | As members |
|---|---|---|
| Boston Red Sox vs New York Yankees | 1081-1285-14 | 2380 |
| Baltimore Orioles vs New York Yankees | 957-1398-17 | 2372 |
| Cleveland Guardians vs Detroit Tigers | 1177-1171-12 | 2360 |
| Baltimore Orioles vs Boston Red Sox | 1054-1285-13 | 2352 |
| Chicago White Sox vs Minnesota Twins | 1201-1135-15 | 2351 |
| Chicago White Sox vs Cleveland Guardians | 1139-1144-18 | 2301 |
| Detroit Tigers vs Minnesota Twins | 1179-1103-17 | 2299 |
| Chicago White Sox vs Detroit Tigers | 1123-1149-16 | 2288 |
| Cleveland Guardians vs Minnesota Twins | 1215-1059-10 | 2284 |
| Boston Red Sox vs Cleveland Guardians | 1016-1077-8 | 2101 |
| Cleveland Guardians vs New York Yankees | 919-1170-11 | 2100 |
| Minnesota Twins vs Athletics | 1036-1032-24 | 2092 |
"As members" counts the meetings played while both teams were in the conference; the record is every MLB meeting.
Against every other conference
| Opponent | Record | Most played |
|---|---|---|
| National League | 5368-5122-3 | Athletics vs San Francisco Giants |
Counts each game by both teams' conference in the season it was played. "Series" is how many different pairs of teams met; "Most played" is the pair that met most often while in these two conferences, with how many of those meetings count here; its bar is the whole series.