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| World Series championship seasons: 2019 |
| Last World Series championship: 2019, 2 seasons ago |
| Montreal Expos became Washington Nationals in 2005 |
| Best finish (by location): |
| Montreal lost to Los Angeles in NL Championship Series in 1981 season |
| Washington beat Houston in World Series in 2019 season |
| TEAM | SEASON | RECORD | PERC | DIV STAND | GB | LEAGUE | PLAYOFFS |
| Montreal | 1969 | 52-110 | .321 | 6th NL East | -48.0 | ||
| Montreal | 1970 | 73-89 | .451 | 6th NL East | -16.0 | ||
| Montreal | 1971 | 71-90 | .441 | 5th NL East | -25.5 | ||
| Montreal | 1972 | 70-86 | .449 | 5th NL East | -26.5 | ||
| Montreal | 1973 | 79-83 | .488 | 4th NL East | - 3.5 | ||
| Montreal | 1974 | 79-82 | .491 | 4th NL East | - 8.5 | ||
| Montreal | 1975 | 75-87 | .463 | T5th NL East | -17.5 | ||
| Montreal | 1976 | 55-107 | .340 | 6th NL East | -46.0 | ||
| Montreal | 1977 | 75-87 | .463 | 5th NL East | -26.0 | ||
| Montreal | 1978 | 76-86 | .469 | 4th NL East | -14.0 | ||
| Montreal | 1979 | 95-65 | .594 | 2nd NL East | - 2.0 | ||
| Montreal | 1980 | 90-72 | .556 | 2nd NL East | - 1.0 | ||
| Montreal | 1981a | 30-25 | .545 | 3rd NL East | - 4.0 | ||
| Montreal | 1981b | 30-23 | .566 | 1st NL East | + 0.5 | WPhi LLAD | |
| Montreal | 1982 | 86-76 | .531 | 3rd NL East | - 6.0 | ||
| Montreal | 1983 | 82-80 | .506 | 3rd NL East | - 8.0 | ||
| Montreal | 1984 | 78-83 | .484 | 5th NL East | -18.0 | ||
| Montreal | 1985 | 84-77 | .522 | 3rd NL East | -16.5 | ||
| Montreal | 1986 | 78-83 | .484 | 4th NL East | -29.5 | ||
| Montreal | 1987 | 91-71 | .562 | 3rd NL East | - 4.0 | ||
| Montreal | 1988 | 81-81 | .500 | 3rd NL East | -20.0 | ||
| Montreal | 1989 | 81-81 | .500 | 4th NL East | -12.0 | ||
| Montreal | 1990 | 85-77 | .525 | 3rd NL East | -10.0 | ||
| Montreal | 1991 | 71-90 | .441 | 6rd NL East | -26.5 | ||
| Montreal | 1992 | 87-75 | .537 | 2nd NL East | - 9.0 | ||
| Montreal | 1993 | 94-68 | .580 | 2nd NL East | - 3.0 | ||
| Montreal | 1994 | 74-40 | .649 | 1st NL East | + 6.0 | 1st NL | strike |
| Montreal | 1995 | 66-78 | .458 | 5th NL East | -24.0 | 12th NL | |
| Montreal | 1996 | 88-74 | .543 | 2nd NL East | - 8.0 | T4th NL | |
| Montreal | 1997 | 78-84 | .481 | 4th NL East | -23.0 | 9th NL | |
| Montreal | 1998 | 65-97 | .401 | 4th NL East | -41.0 | T14th NL | |
| Montreal | 1999 | 68-94 | .420 | 4th NL East | -35.0 | 14th NL | |
| Montreal | 2000 | 67-95 | .414 | 4th NL East | -28.0 | 14th NL | |
| Montreal | 2001 | 68-94 | .420 | 5th NL East | -20.0 | T13th NL | |
| Montreal | 2002 | 83-79 | .512 | 2nd NL East | -19.0 | 7th NL | |
| Montreal | 2003 | 83-79 | .512 | 4th NL East | -18.0 | 10th NL | |
| Montreal | 2004 | 67-95 | .414 | 5th NL East | -29.0 | 15th NL | |
| Washington | 2005 | 81-81 | .500 | 5th NL East | -29.0 | T8th NL | |
| Washington | 2006 | 71-91 | .438 | 5th NL East | -26.0 | 14th NL | |
| Washington | 2007 | 73-89 | .451 | 4th NL East | -16.0 | T11th NL | |
| Washington | 2008 | 59-102 | .366 | 5th NL East | -32.5 | 16th NL | |
| Washington | 2009 | 59-103 | .364 | 5th NL East | -34.0 | 16th NL | |
| Washington | 2010 | 69-93 | .426 | 5th NL East | -28.0 | 14th NL | |
| Washington | 2011 | 80-81 | .497 | 3rd NL East | -21.5 | 8th NL | |
| Washington | 2012 | 98-64 | .605 | 1st NL East | + 4.0 | 1st NL | bye LStL |
| Washington | 2013 | 86-76 | .531 | 2nd NL East | -10.0 | 6th NL | |
| Washington | 2014 | 96-66 | .593 | 1st NL East | +17.0 | 1st NL | bye LSF |
| Washington | 2015 | 83-79 | .512 | 2nd NL East | - 7.0 | 7th NL | |
| Washington | 2016 | 95-67 | .586 | 1st NL East | + 8.0 | 2nd NL | bye LLAD |
| Washington | 2017 | 97-65 | .599 | 1st NL East | +20.0 | 2nd NL | bye LChC |
| Washington | 2018 | 82-80 | .506 | 2nd NL East | -10.0 | T8th NL | |
| %Washington | 2019 | 93-69 | .574 | 2nd NL East | - 4.0 | 4th NL | WMil WLAD WStL WHou |
| Washington | 2020 | 26-34 | .433 | T4th NL East | - 9.0 | T11th NL | |
| Washington | 2021 | 65-97 | .401 | 5th NL East | -23.5 | 13th NL |