The Mets have won four NL championships:
1) 1969 - Won the World Series against Baltimore 4 games to 1.
2) 1973 - Lost the World Series to Oakland 4 games to 3.
3) 1986 - Won the World Series against Boston 4 games to 3.
4) 2000 - Lost the World Series to the Yankees 4 games to 1.
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1986 was the last time against the Boston, Red Sox. They also won in 1969. They also appeared in the 1973 and 2000 world series.
The Mets have won two World Series championships ... 1969 and 1986. In 1969 they beat the Baltimore Orioles and in 86' The Amazin' Mets beat The Boston Red Sox.