The longest currently active MLB Postseason drought belongs to the Seattle Mariners, who have gone 19 seasons without making the Postseason.
The longest all time MLB Postseason drought belongs to the St. Louis Browns, who went 41 seasons without making the Postseason between 1903 and 1944.
| Team | Years | Start Year |
|---|---|---|
| Seattle Mariners | 19 | 2002 |
| Philadelphia Phillies | 9 | 2012 |
| Detroit Tigers | 6 | 2015 |
| Los Angeles Angels | 6 | 2015 |
| Pittsburgh Pirates | 5 | 2016 |
| Kansas City Royals | 5 | 2016 |
| San Francisco Giants | 4 | 2017 |
| New York Mets | 4 | 2017 |
| Texas Rangers | 4 | 2017 |
| Baltimore Orioles | 4 | 2017 |
| Arizona Diamondbacks | 3 | 2018 |
| Boston Red Sox | 2 | 2019 |
| Colorado Rockies | 2 | 2019 |
| Washington Nationals | 1 | 2020 |
| Team | Years | Start Year | End Year |
|---|---|---|---|
| St. Louis Browns | 41 | 1903 | 1944 |
| Cleveland Indians | 40 | 1955 | 1995 |
| Oakland Athletics | 39 | 1932 | 1971 |
| Chicago White Sox | 39 | 1920 | 1959 |
| Chicago Cubs | 38 | 1946 | 1984 |
| Texas Rangers | 35 | 1961 | 1996 |
| Philadelphia Phillies | 34 | 1916 | 1950 |
| Boston Braves | 33 | 1915 | 1948 |
| Pittsburgh Pirates | 32 | 1928 | 1960 |
| Minnesota Twins | 31 | 1934 | 1965 |
| Washington Nationals | 30 | 1982 | 2012 |
| Kansas City Royals | 28 | 1986 | 2014 |
| Cleveland Indians | 27 | 1921 | 1948 |
| Boston Red Sox | 27 | 1919 | 1946 |
| Philadelphia Phillies | 25 | 1951 | 1976 |
| Milwaukee Brewers | 25 | 1983 | 2008 |
| Detroit Tigers | 24 | 1910 | 1934 |
| Chicago White Sox | 23 | 1960 | 1983 |
| St. Louis Cardinals | 23 | 1903 | 1926 |
| Detroit Tigers | 22 | 1946 | 1968 |
| Baltimore Orioles | 21 | 1945 | 1966 |
| Washington Senators | 21 | 1903 | 1924 |
| Boston Red Sox | 20 | 1947 | 1967 |
| Brooklyn Dodgers | 20 | 1921 | 1941 |
| Toronto Blue Jays | 20 | 1995 | 2015 |
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