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Reuters won in international reporting for its coverage of the violent persecution of a Muslim minority in Myanmar who in efforts to flee often fall into the hands of brutal human-trafficking networks.
The celebrated prizes, awarded by Columbia University, are the most respected in US journalism and can bring badly needed attention and recognition to newspapers and websites suffering from economic pressures and budget constraints.
The prize-winning work by the Guardian US and The Washington Post in the Pulitzer's public service category was based on documents leaked by former NSA contractor Edward Snowden, who revealed details of global electronic surveillance by the US spy agency.
Reporting on the leaks not only sparked international debate over the limits of government surveillance but prompted President Barack Obama to introduce curbs on NSA spying powers.
"We are particularly grateful for our colleagues across the world who supported the Guardian in circumstances which threatened to stifle our reporting," Guardian Editor in Chief Alan Rusbridger said in a statement.
"And we share this honor, not only with our colleagues at The Washington Post, but also with Edward Snowden, who risked so much in the cause of the public service which has today been acknowledged by the award of this prestigious prize," he said.
Russia granted Snowden temporary asylum last year after the US Justice Department charged him with violating the Espionage Act.
In giving Reuters its first Pulitzer for text coverage, the board commended Jason Szep and Andrew R.C. Marshall for their "courageous reports" on the Rohingya, who in their efforts to flee the Southeast Asian country often fall victim to human-trafficking networks.
"For two years, Reuters reporters have tirelessly investigated terrible human-rights abuses in a forgotten corner of the Muslim world, bringing the international dimensions of the oppressed Rohingya of Myanmar to global attention," Stephen Adler, Reuters editor-in-chief, said in a statement.
Szep, from Washington, said: "What we were writing about was under-reported. I hope through this, there is greater international attention to the risks and presence of religious violence in Myanmar."
Reuters was also a finalist in the investigative reporting category for a series by Megan Twohey, which exposed the underground market for adopted children. Her work won praise for "triggering governmental action to curb the practice" of exchanging unwanted kids online.
Goran Tomasevic of Reuters was named a finalist for breaking news photography, with judges recognizing "his sequence of photographs that chronicle two hours of fierce combat on the rebel frontline in Syria's civil war."
The breaking news photography prize went to Tyler Hicks of The New York Times for coverage of the attack by Islamist militants at Westgate mall in Nairobi, Kenya. The feature photography prize went to Josh Haner of The New York Times for an essay on a Boston Marathon bomb blast victim.
The Boston Globe won for its breaking news coverage of the 2013 Boston Marathon bombing and the ensuing manhunt. Finalists included The Arizona Republic for coverage of a wildfire that killed 19 firefighters and The Washington Post for coverage of the mass shooting at the Washington Navy Yard.
The prize for investigative reporting went to Chris Hamby of The Center for Public Integrity for reports on how some lawyers and doctors rigged a system to deny benefits to coal miners stricken with black lung disease.
The prize for explanatory reporting went to Eli Saslow of the Washington Post for work on the prevalence of food stamps in post-recession America.
The prize for local reporting went to Will Hobson and Michael LaForgia of the Tampa Bay Times for an investigation into squalid housing conditions for the city's homeless population. The prize for national reporting went to David Philipps of The Gazette in Colorado Springs, Colorado, for his examination of how wounded combat veterans are mistreated.
No award was given in the category of feature writing.
The commentary prize went to Stephen Henderson of the Detroit Free Press and the criticism prize went to Inga Saffron of the Philadelphia Inquirer. The editorial writing prize was awarded to the staff of The Oregonian and editorial cartooning went to Kevin Siers of the Charlotte Observer.