The paper is being distributed at the city's Metro stations, on university campuses and in other areas of the city.
The 20- to 24-page paper, which was launched yesterday, has a print run of 125,000 and features regional, national and world news as well as entertainment listings.
Though it is the first free newssheet to be launched in the US capital, it joins a growing number of free 'metro' papers in other American cities.
Metro Publishing Inc produces such papers in Boston and Philadelphia, and in 13 other cities around the world, including Stockholm, where the whole free Metro revolution began.
The Metro phenomenon has proved hugely popular in the UK, with Metro papers launched in London, Manchester and Newcastle, among other cities.
In London, Associated Newspapers and Express Newspapers have been butting heads as the latter moves slowly forward with its plans to launch a rival to Associated's Metro.
The Express is being edited by Dan Caccavaro, who was formerly editor of the Boston Metro.
According to Caccavaro: "Even in a region served by a paper as good as the Post, there is a huge segment of the population that just can't find the time to read a paper every day but still wants to know what's happening in the world. Express is meant to serve that need."
He added: "We're not trying to be a paper of record; we don't intend to do investigative work or offer the kind of thoughtful analysis people expect from the Post. But we intend to deliver an intelligent, though brief, summary of the news. I think people will soon find it an indispensable part of their morning ritual."
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