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Obama supporters cheered during an election night watch party in Chicago, Illinois, as results favouring the incumbent trickled in.
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People at the Romney campaign's election night event in Boston, Massachusetts, react to results displayed on a television screen.
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Mitt Romney spent election day campaigning, here talking to reporters aboard his campaign plane en route to Boston, Massachusetts.
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President Obama called volunteers from a campaign office in Chicago, Illinois, to thank them for their efforts.
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Many voters in New York and New Jersey voted at makeshift polling stations due to disruption from the storm Sandy, that killed dozens and caused widespread destruction.
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People wait in line to vote at the Columbia Heights Educational Campus in Washington, DC.
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Denver election worker Constance Rolon waits for voters to deposit their ballots at the Denver Elections Division headquarters.
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Donna Kaye Erwin posts the results after the 10 registered voters in the small village of Dixville Notch, New Hampshire, cast the first election day ballots.
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Early voters cast their absentee ballots at the Minneapolis City Hall. About 30 million people voted before election day, either by mail or in person.
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A poll worker tapes up a sign on a voting machine warning voters of the sensitivity of the touch screen during the US presidential election in Pineville, North Carolina.
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Voters wait in line to vote at Harrison United Methodist Church in Pineville, North Carolina.
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A voter casts her ballot in Newark,Ohio.
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Republican vice presidential candidate Paul Ryan and his wife Janna vote accompanied by their children Charlie, Sam and Liza in Janesville, Wisconsin.
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Raena Lamont, 3, is dressed as the fictional character Captain America at a polling center doubling as a donation site in New York City as the city recovers from Sandy.
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People around the world were awaiting the results. This picture is from an election party in Berlin, Germany.