Users spent an average of 62 minutes and two seconds on in March, compared with 41 minutes and five seconds on . In third spot was Yahoo Finance.
The research, by Nielsen//NetRatings, showed that the Journal's specially launched "Iraq in Transition" section was one of the most heavily viewed areas of the site.
The site was also boosted by its decision to bring forward the launch of its new email news and comment service, The Afternoon Report, following the outbreak of war in Iraq. The twice-daily email, which covers global business, economic and political affairs, is designed to help online subscribers to the Wall Street Journal stay on top of the latest breaking stories.
WSJ.com, which costs $79 (£49.10) a year to access, also recorded the most page numbers per person viewed in a month, with 47 page views.
Todd Larsen, president of Dow Jones Consumer Electronic Publishing, said: "We believe that our exceptionally high per-person usage in the month of March reflects the fact that our subscribers turn to the Online Journal for insightful news reporting, analysis and commentary on the most critical issues of the day."
The site has 675,000 subscribers, making it the largest paid-subscription site on the web.
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