The S&P 500 and tech-heavy NASDAQ were also at new highs, fuelled by hopes that President Donald Trump’s policies will boost the economy.
The Dow was up 0.8% at 20,074 points in afternoon trading.
Investors’ cash has poured into shares on hopes of tax cuts and higher growth.
Donald Trump’s senior adviser Kellyanne Conway was quick to comment on the news, tweeting that the landmark was down to “The Trump Effect”.
If the index stays above 20,000 by the time the day’s trading ends, then it would mean the 42-session rise from the first close above the 19,000 mark would be the second quickest 1,000 point rise of all time.
The Dow rose from 10,000 to 11,000 in only 24 trading days between March 29 and May 3, 1999, while the rise from 18,000 to 19,000 took 483 trading days (nearly two years).
Financial stocks have been a major factor in the gain – with Goldman Sachs and JPMorgan accounting for around 20% of it.
This is because investors believe that some of Donald Trump’s policies will trigger inflation and produce a rise in interest rates.
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